refactored isEnabled methods for publishing functions
refactored isEnabled methods for publishing functions

these can be re-expressed using the filter helper just like the
cloneTiddler resulting in easier to follow code.

TiddlySpace/tiddlyspace,FND/tiddlyspace,FND/tiddlyspace,FND/tiddlyspace,TiddlySpace/tiddlyspace,TiddlySpace/tiddlyspace