Update issue #249 : Render and connect pin will work on first available unconnected pins of selected filter
Duplicate Selected Filters works on the parent filters of any selected pins.
Render pin operates selected output pins or on first unconnected output pin of selected filters.
Connect pin operates on single selected pin or first unconnected output or input pin of single selected filter

git-svn-id: http://graph-studio-next.googlecode.com/svn/trunk@414 c2f33eb2-41b2-391d-4cb4-d9d0608729ba