Fixes to GPC:  * Add plug-in handlers to {{{allPluginHandlers}}}.  * Lazy-instantiation support (I thought this got committed already).  * No reason to call {{{+setWithSet:}}} just to call {{{-intersectSet:}}} with the result.
Fixes to GPC:
 * Add plug-in handlers to {{{allPluginHandlers}}}.
 * Lazy-instantiation support (I thought this got committed already).
 * No reason to call {{{+setWithSet:}}} just to call {{{-intersectSet:}}} with the result.

--HG--
extra : convert_revision : svn%3A99687598-2e92-11dd-8019-fe7b9d601d1b/trunk%403448

PersonifyInc/growl,incbee/Growl,PersonifyInc/growl,PersonifyInc/growl,incbee/Growl,incbee/Growl,PersonifyInc/growl,incbee/Growl,incbee/Growl,PersonifyInc/growl