[FIX]Usability: 20 chars is way too short of the forum post title for email programs. Raised to 50 chars. In any case, most email programs allow the user to shorten the width of the subject if desired in narrower screens, but they can't guess what was the title about if the information is not in the message subject in case they have some more space for reading more of the subject when some space is available in the screen. Common daily use case: t.o forums....

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@50213 b456876b-0849-0410-b77d-98878d47e9d5