Changes by: Jason Hickey (jyh at cs.caltech.edu)
Date: 2006-01-17 16:53:49 -0800 (Tue, 17 Jan 2006)
Revision: 8498
Log message:

      Allow preprocessing on the tactic_arg before the proof is created.
      This probably isn't quite right.  When the "select" resource is changed,
      existing proofs will not be changed.