fixing version.py for the funky four-digit version numbering that we
use to keep first three digits of pyaccumulo's version x.y1.y2.z equal
to accumulo's version.  This is mostly PEP 440 compliant, because the
z value gets increment between tags.  That is, three commits after a
version tagged as 1.5.0.6 will get the version number 1.5.0.7.dev3