Item12494: fix unit tests, and added ENHANCE type to enhance the description of an existing configuration type; for example when adding new classes to a SELECTCLASS

git-svn-id: http://svn.foswiki.org/trunk/core@16716 0b4bb1d4-4e5a-0410-9cc4-b2b747904278
Item12494: ENHANCE config type doc

git-svn-id: http://svn.foswiki.org/trunk/core@16717 0b4bb1d4-4e5a-0410-9cc4-b2b747904278