Revert "Item12665:  Revert some of multi-tmce changes"

This reverts commit 5a540984bc79c72b4b41faa8c8757257eddf1f39.

Conflicts:
	TinyMCEPlugin/lib/Foswiki/Plugins/TinyMCEPlugin/TinyMCE.pm

git-svn-id: http://svn.foswiki.org/trunk@17444 0b4bb1d4-4e5a-0410-9cc4-b2b747904278