Preparation for conda release.

Updates due to John Sundh in preparation for conda release, added Variant_Filter.py as executable.

DESMAN in Python 3

The DESMAN is now compatible with Python 3.

Last Python 2.7 version of DESMAN

Last version using Python 2.7 migrating to Python 3 after this.

Initial beta release of DESMAN

Initial beta release of DESMAN used to generate results in upcoming Genome Biology publication.