cleanup & fixes

chopshop
  - removed signal pass to nids b/c removed debug code that terminates nids in ChopLib.py

ChopLib.py
  - uncommmented coded that was commented for debugging

ChopNids.py
  - removed interrupt variable handler
  - condensed code to fix multiple calls to nids.next()

ChopSurgeon.py
  - added long back to surgeon_proc_list args
  - set self.long inside surgeon_proc_list explicitly
  - condensed code
removed unused signal handling code