[PyMOL] patch: get the data and demo stuff out of the python module directory

Hi,

On Unix-like systems, stock pymol installs all images/data files/demo
stuff under /usr/lib/python2.x/site-packages/pymol/. I believe this is a
violation of the File Hierachy Standard (FHS) (well, at least its
spirit, I'm not sure about the letter), as only architecture-dependent
files should be under /usr/lib. 

Thus, I've cleaned up my current patch for pymol-0.88, replacing
$PYMOL_PATH with $PYMOL_DATA_PATH and $CHEMPY_DATA_PATH, under the
observation that $PYMOL_PATH is 99% only needed in order for the
examples and other stuff to find data.

Currently, I put everything under data/{pymol,chempy) under
/usr/share/pymol and test/dat/*, data/tut/*, examples/devel/cgo03.py
into /usr/share/pymol/demo. This can of course be tuned at will.

One needs to set $PYMOL_DATA_PATH and $CHEMPY_DATA_PATH of course, I'm
doing this in a small wrapper script:

#!/bin/sh
# debian wrapper script for pymol

export PYMOL_DATA_PATH=/usr/share/pymol
export CHEMPY_DATA_PATH=/usr/share/chempy

python /usr/lib/python2.2/site-packages/pymol/__init__.py


I've attached the patch, do you think that would make sense for pymol
proper as well? If not, I'll have to keep maintaining it in the debian
package.


cheers,

Michael