Description of problem:

When the release numbers in a Revision History file contain more than one digit, Publican cannot correctly interleave the Revision Histories of the source language and any translated language.


Version-Release number of selected component (if applicable):
3.0

How reproducible:
100%

Steps to Reproduce:
1. create a revision histories file with entries like 1-21 1-22 1-23
2. run update_pot and update_po
3. add more revisions to the source language like 1-24 1-25
4. run update_po
5. try to package the translated book
  
Actual results:
Packaging fails with "error: %changelog not in descending chronological order"

Expected results:
Packaging succeeds

Additional info:
See attached sample files