[Dev] New CVS Comment Rule

[Leo Bayer]

"Merged From HEAD" is not a specific enough commit comment as it doesn't 
specify what was merged.  Changes have been made so that CVS will now 
reject these comments.

Copying the comment from the checkin that the merge is based on is a 
nice way to do it without having to think of a new comment.

For example, if the commit on the branch is identical to a commit on the 
HEAD...
Original Commit on HEAD:  "changed thing that does other thing."
Comment for merge:  "merged from head; changed thing that does other thing"

This method makes it easy to correlate the branch commit with the HEAD 
commit, especially when there have been multiple changes on the HEAD.

More specific detail is also commendable but not necessary.

Thanks
 - Leo