GetGeometricStart()/GetGeometricEnd() has been deprecated and
will be removed sooner or later.

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These two algorithms are not tested enough to leave them in.
I will readd them once I find the time to properly test
them.

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DF3 is a very simple format used by PovRay to represent density data.

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removing examples dir, has been replaced with "demos/" for most attractive demos and "code_fragments" for small/lowlevel scripts

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Leopard's install_name_tool doesn't allow to manipulate the
rpaths of mach-o binaries, that's why we have to fall back to the
ugly @executable_path on these systems. This doesn't work properly
when using the default Python coming with the system, since the
library load commands are defined relative to the executable they
were loaded in. If the python the binary and gosty binary are not
in the same path, BANG!

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This bug actually lead to the discovery of an interesting
phenotype of the "for" statement. If a class has the
__getitem__() defined and doesn't have a __iter__(),
Python uses __getitem__() to iterate over the items,
stopping when a IndexError is thrown. Previously we were
throwing a normal RuntimeError which Python didn't recognize
as the end of the list.

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instead of relying on the properties of the vector iterators,
implement our own iterator that gracefully decays to a pointer.
This is save, since the C++ standard requires the vector to store
its elements in a continuous block of memory.

No more stupid Microsoft runtime checks.

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.pyc files are always removed from the bundle, .py files are removed
if a .pyo file exists. This reduces the size of the zipped bundle to
40MB (including compounds.chemlib, excluding the examples).

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