New JGit util method to retrieve changed paths in a commit range (issue 226)
Support relative links in commitdiff page and polish css
Match commit page change path section logic
Implemented compare page for branch/tag/manual diffs (issue-75, issue-133)
Removed commitdiff code code for comparing ranges (issue-133)

This feature was incomplete, reported incorrect information, and has
been replaced by the compare page (issue-75).