- Added new heuristics based on hidelevel results.

Preliminary results:
  1. For typed matching, either heuristic 32 or 34 are best, and far
  superior to the previous best (3).
  2. For untyped matching, partial tests indicate that heuristic 1 is
  best, which is rather interesting.

src/hidelevel.h

@@ -22,5 +22,6 @@
 void hidelevelCompute (const System sys);
 int hidelevelInteresting (const System sys, const Term goalterm);
 int hidelevelImpossible (const System sys, const Term goalterm);
+unsigned int hidelevelFlag (const System sys, const Term goalterm);
 
 #endif