RuleBased conop is an experimental new interface for processing
structures in the conop module. The class exposes a single method
Process with takes care of the complete conop procedure. There are
still a few methods missing, they will be added shortly.

The segfault was showing up when using the sequence viewer in an
application without a GostyApp instance.

There is no short-circuit logic in Python and division by zero gets
raised when abs(rr)==0.

folder because it breaks the make clean command

and a function GaussianSmooth is added

fixed some DLLEXPORTs for exceptions
based ost:Error on std::runtime_error (avoids string member in ost::Error)

Output in file. Choice of output path and filename. Cutom comp lib location.

The Color class now keeps track of RGB and HSV in preparation of better HSV use,
e.g. HSV based gradients. The interface has been extended, and parts of the old
interface have been deprecated (by means of in-source comments, not yet as
messages when using it); this applies to both C++ and Python. Instead of
gfx.Color() use the factory functions gfx.RGB(r,g,b), gfx.RGBA(r,g,b,a),
gfx.HSV(h,s,v) and gfx.HSVA(h,s,v,a). See also gfx/color.hh for in-source doc

naccess does not like dots in path names. Some temporary directories
contain dots, which causes naccess to fail. We now provide a scratch_dir
option, which allows to specify a temporary directory.

Also, allow to set the maximal number of atoms supported by naccess.

added cmake option to set hidden visibility for gcc compiles; fixed several missing visibility declarations