Added support for different CHANGES files.

-If -f <file> is specified then it will use that file as ChangesFile
-If no CHANGES or CHANGES.md is found then it will try to search for CHANGES-<currentdir> (without _x_y)
   - Examples:
   - /ws/FAQ/CHANGES-FAQ
   - /ws/TimeAccounting/CHANGES-TimeAccounting
   - /ws/TimeAccounting_2_1/CHANGES-TimeAccounting
   - /ws/ITSMCore-2_2/CHANGES-ITSMCore  <- Will not work!