mercurial and monotone, but slightly harder till impossible to
do properly for git and svn. Please review and eventually adapt
the code to make it work better (partially fixes issue 450)
* Monotone.php (IDF_Scm_Monotone_Stdio): add support for multiple, equally named options
* Source.php, commit.html: split-off the global commit template (which had some separate code already for SVN) and adapt the left blocks for mtn to shorten branch and tag names just like we do everywhere else
