remove comments at the first place to avoid to much work for the regex engine (ToAscii)
Fixed: OutputFilterText AutoLink CVE (bug#10521).
Squashed commit of the following:

commit 9e53d226b1a5ed5c5949a3264886300bda066e3c
Author: s7design <otrs@s7designcreative.com>
Date:   Tue Jun 3 01:58:01 2014 +0200

    http://bugs.otrs.org/show_bug.cgi?id=10521

    Changed regex for CVE, added test_mail for it
Merge branch 'reneeb_htmlutils_remove_htmlcomments' of github.com:reneeb/otrs
Fixed bug#10549 - SelectAllCheckboxes doesn't work as expected.
Merge remote-tracking branch 'upstream/master' into otrs-master