XSB Src (SVN)-old

nodes. These nodes dont have subgoal frames, but do have
callnodes, so I've been chaning how pointers are passed around in
several places. Eventually, I want all the SF-based IDG
traversal routines to be Callnode based, but this will take
another day or so.

Added get_call/4, which now also returns a pointer to the
callnode. get_call/3 is now defined in terms of that predicate.

Added immediate_affects_callnode_ptrlist which finds the
callnodes of all subgoals an incremental subgoal affects.

Documented various cases of table_inspection_predicates, and
commented out some code that is no longer used.