Allow any module to execute downstream only with shift depressed
Allow any module to execute downstream only with shift depressed

jessdtate/SCIRun,jcollfont/SCIRun,jessdtate/SCIRun,moritzdannhauer/SCIRunGUIPrototype,jcollfont/SCIRun,jessdtate/SCIRun,collint8/SCIRun,jcollfont/SCIRun,ajanson/SCIRun,ajanson/SCIRun,moritzdannhauer/SCIRunGUIPrototype,ajanson/SCIRun,ajanson/SCIRun,moritzdannhauer/SCIRunGUIPrototype,moritzdannhauer/SCIRunGUIPrototype,collint8/SCIRun,moritzdannhauer/SCIRunGUIPrototype,collint8/SCIRun,ajanson/SCIRun,moritzdannhauer/SCIRunGUIPrototype,collint8/SCIRun,jessdtate/SCIRun,jessdtate/SCIRun,jcollfont/SCIRun,collint8/SCIRun,jcollfont/SCIRun,ajanson/SCIRun,jessdtate/SCIRun,moritzdannhauer/SCIRunGUIPrototype,jcollfont/SCIRun,jessdtate/SCIRun,jessdtate/SCIRun,collint8/SCIRun,collint8/SCIRun,collint8/SCIRun,ajanson/SCIRun,jcollfont/SCIRun