Item12466: revert $formfield to <=1.1.4 compatibility, add =display= mechanism from 1.2.0 codebase to support 1.1.5-1.1.8 wikiapps

git-svn-id: http://svn.foswiki.org/branches/Release01x01/UnitTestContrib@16663 0b4bb1d4-4e5a-0410-9cc4-b2b747904278