[FIX] convene: Delete user wasn't working if deleting more than one user due to page not reloading (so reload), also ask user before removing a row

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@48074 b456876b-0849-0410-b77d-98878d47e9d5
[FIX] convene: Exclude from WYSIWYG rendering (was bad)

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@48075 b456876b-0849-0410-b77d-98878d47e9d5
[MRG] Automatic merge, branches/12.x 48072 to 48075

git-svn-id: file:///var/local/code.tiki.org/tikisvn/trunk@48076 b456876b-0849-0410-b77d-98878d47e9d5