Only try to work out the previous version number if the master feed file actually...
treeefbbfc7fd2a7113faf26d871c5118f69ff54c603
-rwxr-xr-x 2748 0release
-rw-r--r-- 1195 0release.xml
-rw-r--r-- 26536 COPYING
-rw-r--r-- 1161 README
-rw-r--r-- 13631 release.py
-rw-r--r-- 3161 scm.py
-rw-r--r-- 2513 setup.py