Tiki logs: change from pop-over (for longer text) to read-only text area. 1-It's was not obvious how to get the truncated text and 2-This way, it's easy to copy-paste the log. Could be nicer, but it's functional.

git-svn-id: file:///var/local/code.tiki.org/tikisvn/trunk@52357 b456876b-0849-0410-b77d-98878d47e9d5