codeintel: oop: avoid sending pref change notifications on unchanged prefs
http://bugs.activestate.com/show_bug.cgi?id=101312
rn=codeintel: avoid rescanning dependent files on modification

(integrated from komodo (trunk) change 82860 by marky)

git-svn-id: http://svn.openkomodo.com/repos/openkomodo/trunk@13909 b87d16e7-d29f-4ee1-b5ec-817d645d335f