Item12803: improve renderting thumnails for topics

also:
* support jquery.validate in topic creator
* added dependency on NatEditPlugin



git-svn-id: http://svn.foswiki.org/trunk@17406 0b4bb1d4-4e5a-0410-9cc4-b2b747904278
Item12803: prep rel


git-svn-id: http://svn.foswiki.org/trunk@17407 0b4bb1d4-4e5a-0410-9cc4-b2b747904278