[FIX] sign plugin: Some improvement on the signature info popup - was failing and being annoying when line wraps were caused by changes in the text, so make the popup absolute position and use js to show & hide. Better, but some more to do...

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/11.x@46403 b456876b-0849-0410-b77d-98878d47e9d5