Item11267: Add a pre-commit hook to check perltidy

Also add copyrights to commit-msg exit.  And truncate the logged
commit message at Untracked files when reporting an error.

git-svn-id: http://svn.foswiki.org/trunk/core@17379 0b4bb1d4-4e5a-0410-9cc4-b2b747904278