[FIX] tablesorter: Handle paginate parameter input properly, also in case not input perfectly by user

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@50581 b456876b-0849-0410-b77d-98878d47e9d5
[SEC] enhance permission check (thanks Marc)

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@50583 b456876b-0849-0410-b77d-98878d47e9d5