diff --git a/doc/html/_modules/promod3/core/helper.html b/doc/html/_modules/promod3/core/helper.html
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+
+ <h1>Source code for promod3.core.helper</h1><div class="highlight"><pre>
+<span class="sd">"""</span>
+<span class="sd">Uncategorised functions which may come handy at several places.</span>
+<span class="sd">"""</span>
+
+<span class="kn">import</span> <span class="nn">sys</span>
+<span class="kn">import</span> <span class="nn">ost</span>
+
+<div class="viewcode-block" id="MsgErrorAndExit"><a class="viewcode-back" href="../../../core/helper.html#promod3.core.helper.MsgErrorAndExit">[docs]</a><span class="k">def</span> <span class="nf">MsgErrorAndExit</span><span class="p">(</span><span class="n">msg</span><span class="p">,</span> <span class="n">exit_status</span><span class="p">):</span>
+ <span class="sd">'''</span>
+<span class="sd"> Send a messages to the |ost_s| :ost_docs:`error log <base/logging/>` and exit</span>
+<span class="sd"> the Python interpreter.</span>
+
+<span class="sd"> :param msg: The message.</span>
+<span class="sd"> :type msg: :class:`str`</span>
+
+<span class="sd"> :param exit_status: Exit code, ends up in ``$?`` in the shell. ``0`` is</span>
+<span class="sd"> traditionally reserved to successful commands.</span>
+<span class="sd"> :type exit_status: :class:`int`</span>
+
+<span class="sd"> :returns: No return value, exits script with value ``exit_status``.</span>
+<span class="sd"> '''</span>
+ <span class="n">ost</span><span class="o">.</span><span class="n">LogError</span><span class="p">(</span><span class="n">msg</span><span class="p">)</span>
+ <span class="n">sys</span><span class="o">.</span><span class="n">exit</span><span class="p">(</span><span class="n">exit_status</span><span class="p">)</span>
+</div>
+<span class="n">__all__</span> <span class="o">=</span> <span class="p">(</span>
+ <span class="s">'MsgErrorAndExit'</span><span class="p">,</span>
+<span class="p">)</span>
+</pre></div>
+
+ </div>
+ </div>
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+ Enter search terms or a module, class or function name.
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diff --git a/doc/html/_sources/core/helper.txt b/doc/html/_sources/core/helper.txt
new file mode 100644
index 0000000000000000000000000000000000000000..c790f0ab5a8f3c4465f858bcbbd89c5264035444
--- /dev/null
+++ b/doc/html/_sources/core/helper.txt
@@ -0,0 +1,36 @@
+:mod:`~promod3.core.helper` - Shared functionality for the everything
+================================================================================
+
+.. currentmodule:: promod3.core.helper
+
+Introduction
+--------------------------------------------------------------------------------
+
+We collect functions here, which should be useful in many places but would make
+rather empty modules left alone.
+
+
+Messages
+--------------------------------------------------------------------------------
+
+.. testcode:: helper
+ :hide:
+
+ from promod3.core import helper
+
+ try:
+ helper.MsgErrorAndExit("Something failed!", 1)
+ except SystemExit, e:
+ if e.code == 1:
+ pass
+ else:
+ raise
+
+.. doctest:: helper
+
+ from promod3.core import helper
+
+ helper.MsgErrorAndExit("Something failed!", 1)
+
+.. autofunction:: MsgErrorAndExit
+
diff --git a/doc/html/core/helper.html b/doc/html/core/helper.html
new file mode 100644
index 0000000000000000000000000000000000000000..7af2deb5b156b43f5797d725b631c493be3c54ac
--- /dev/null
+++ b/doc/html/core/helper.html
@@ -0,0 +1,167 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
+ "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
+
+
+<html xmlns="http://www.w3.org/1999/xhtml">
+ <head>
+ <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
+
+ <title>helper - Shared functionality for the everything — ProMod3 0 documentation</title>
+
+ <link rel="stylesheet" href="../_static/default.css" type="text/css" />
+ <link rel="stylesheet" href="../_static/pygments.css" type="text/css" />
+
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+ var DOCUMENTATION_OPTIONS = {
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+ VERSION: '0',
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+ };
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+ <link rel="top" title="ProMod3 0 documentation" href="../index.html" />
+ <link rel="up" title="core - ProMod3 core functionality" href="index.html" />
+ <link rel="next" title="meld - Coordinate modeling" href="../meld/index.html" />
+ <link rel="prev" title="argcheck - Standard tests for command line arguments" href="argcheck.html" />
+ </head>
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+ accesskey="I">index</a></li>
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+ >modules</a> |</li>
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+ <div class="body">
+
+ <div class="section" id="helper-shared-functionality-for-the-everything">
+<h1><tt class="xref py py-mod docutils literal"><span class="pre">helper</span></tt> - Shared functionality for the everything<a class="headerlink" href="#helper-shared-functionality-for-the-everything" title="Permalink to this headline">¶</a></h1>
+<div class="section" id="introduction">
+<h2>Introduction<a class="headerlink" href="#introduction" title="Permalink to this headline">¶</a></h2>
+<p>We collect functions here, which should be useful in many places but would make
+rather empty modules left alone.</p>
+</div>
+<div class="section" id="messages">
+<h2>Messages<a class="headerlink" href="#messages" title="Permalink to this headline">¶</a></h2>
+<div class="highlight-python"><div class="highlight"><pre><span class="kn">from</span> <span class="nn">promod3.core</span> <span class="kn">import</span> <span class="n">helper</span>
+
+<span class="n">helper</span><span class="o">.</span><span class="n">MsgErrorAndExit</span><span class="p">(</span><span class="s">"Something failed!"</span><span class="p">,</span> <span class="mi">1</span><span class="p">)</span>
+</pre></div>
+</div>
+<dl class="function">
+<dt id="promod3.core.helper.MsgErrorAndExit">
+<tt class="descclassname">promod3.core.helper.</tt><tt class="descname">MsgErrorAndExit</tt><big>(</big><em>msg</em>, <em>exit_status</em><big>)</big><a class="reference internal" href="../_modules/promod3/core/helper.html#MsgErrorAndExit"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#promod3.core.helper.MsgErrorAndExit" title="Permalink to this definition">¶</a></dt>
+<dd><p>Send a messages to the OST <a class="reference external" href="http://www.openstructure.org/docs/1.3/base/logging/">error log</a> and exit
+the Python interpreter.</p>
+<table class="docutils field-list" frame="void" rules="none">
+<col class="field-name" />
+<col class="field-body" />
+<tbody valign="top">
+<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
+<li><strong>msg</strong> (<a class="reference external" href="https://docs.python.org/2.7/library/functions.html#str" title="(in Python v2.7)"><tt class="xref py py-class docutils literal"><span class="pre">str</span></tt></a>) – The message.</li>
+<li><strong>exit_status</strong> (<a class="reference external" href="https://docs.python.org/2.7/library/functions.html#int" title="(in Python v2.7)"><tt class="xref py py-class docutils literal"><span class="pre">int</span></tt></a>) – Exit code, ends up in <tt class="docutils literal"><span class="pre">$?</span></tt> in the shell. <tt class="docutils literal"><span class="pre">0</span></tt> is
+traditionally reserved to successful commands.</li>
+</ul>
+</td>
+</tr>
+<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first last">No return value, exits script with value <tt class="docutils literal"><span class="pre">exit_status</span></tt>.</p>
+</td>
+</tr>
+</tbody>
+</table>
+</dd></dl>
+
+</div>
+</div>
+
+
+ </div>
+ </div>
+ </div>
+ <div class="sphinxsidebar">
+ <div class="sphinxsidebarwrapper">
+ <h3><a href="../index.html">Table Of Contents</a></h3>
+ <ul>
+<li><a class="reference internal" href="#"><tt class="docutils literal"><span class="pre">helper</span></tt> - Shared functionality for the everything</a><ul>
+<li><a class="reference internal" href="#introduction">Introduction</a></li>
+<li><a class="reference internal" href="#messages">Messages</a></li>
+</ul>
+</li>
+</ul>
+
+ <h4>Previous topic</h4>
+ <p class="topless"><a href="argcheck.html"
+ title="previous chapter"><tt class="docutils literal"><span class="pre">argcheck</span></tt> - Standard tests for command line arguments</a></p>
+ <h4>Next topic</h4>
+ <p class="topless"><a href="../meld/index.html"
+ title="next chapter"><tt class="docutils literal"><span class="pre">meld</span></tt> - Coordinate modeling</a></p>
+ <h3>This Page</h3>
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+ rel="nofollow">Show Source</a></li>
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+ Last updated on Oct 16 09:31, 2014.
+ Created using <a href="http://sphinx-doc.org/">Sphinx</a> 1.2.3.
+ </div>
+ </body>
+</html>
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