Recommit revision 365 (undoing revision 375, which reverted revision 365).

Recommit revision 365 (undoing revision 375, which reverted revision 365).
Fix the case in NodeBuilderBlack that triggered bug #82.  (Fixes bug #82.)

This also fixes regression failures from this morning (2010 Apr 4), in
the optimized builds, for which a fix was included in 365 and reverted
in 375.  They looked like this:

  In ExprBlack::testGetConst:
  /usr/local/share/cvc4/src/cvc4-2010-04-04/builds/x86_64-unknown-linux-gnu/production/../../../test/unit/expr/expr_black.h:377: Error: Expected (a->getConst<Kind>()) to throw (IllegalArgumentException) but it didn't throw
  /usr/local/share/cvc4/src/cvc4-2010-04-04/builds/x86_64-unknown-linux-gnu/production/../../../test/unit/expr/expr_black.h:378: Error: Expected (b->getConst<Kind>()) to throw (IllegalArgumentException) but it didn't throw
  [etc..]