Revert "Define __str__ for PackageVersion"

This reverts commit 2439d95.

Passive-aggressively, as it were, since it was never reviewed.

Note that in both python 2 and 3, __str__ implicitly calls __repr__.

Author: edquist

osgtest/library/core.py

@@ -92,8 +92,6 @@ def __init__(self, pkgname):
     def __repr__(self):
         return "%s:%s-%s" % self.evr
 
-    __str__ = __repr__
-
     def __cmp__(self, evr):
         if isinstance(evr, str):
             evr = stringToVersion(evr)