tablesorter: update documentation

git-svn-id: file:///var/local/code.tiki.org/tikisvn/trunk@51022 b456876b-0849-0410-b77d-98878d47e9d5
tablesorter: clean up ids

git-svn-id: file:///var/local/code.tiki.org/tikisvn/trunk@51023 b456876b-0849-0410-b77d-98878d47e9d5
tablesorter: clean up more class and id names and add documentation

git-svn-id: file:///var/local/code.tiki.org/tikisvn/trunk@51024 b456876b-0849-0410-b77d-98878d47e9d5