Item12516: improved end user documentation, and converted for standards in anticipation of accepting to core

git-svn-id: http://svn.foswiki.org/trunk@16766 0b4bb1d4-4e5a-0410-9cc4-b2b747904278
Item12515: recoded for deeper understanding of jsonRpcContrib. Dropped support for XML.

git-svn-id: http://svn.foswiki.org/trunk@16767 0b4bb1d4-4e5a-0410-9cc4-b2b747904278