Adding back Debian build system
Changed Makefile to use tabs
Changed makefile to correctly copy `suns_aa_motifs.py`
Changed plugin to correctly work on old PyMOL versions
Changed Debian to fix plugin name

The plugin was trying to install as `__init__.py` in the plugins directory, but
that conflicted with the existing `__init__.py`.  The solution is to change the
name to `suns-search.py`.
Added an empty `__init__` to `suns_aa_motifs.py`

This is so that PyMOL doesn't complain since it tries to initialize every file
in the plugins directory.
Merge pull request #6 from Gabriel439/master

Added Debian installer