XSB Src (SVN)-old

Fixed return_lazy_calllist (a critical piece of code for incremental tabling) to properly determine the amount of heap size needed
for returning a subgoal. The problem was that the size determination that had been used assumed that no registers were otherwise used, and
overwrote the registers used in this builtin (which is called by an interrupt handler for the purposes of recomputing invalid subgoals).

There are a number of similar cases that need to be checked in other routines that are not so heavily used. I'll be fixing those in the next
few days.

Fixed bug in return_lazy_affected when doing view maintenance.

Better heap allocation checking for returning tabled subgoals -- I hope1

updated manuals

Added docmentation about set_forest_logging_for_pred/2.

CHanges to support the PSC refactoring and forest log changes as mentioned in the previous email.

Changes to allow forest logging to be turned on or off on a per-predicate basis.

In addition, I restructured the PSC structure to include bitmapped fields. It turned out that this wasnt necessary for the forest
logging change, as I keep the forest logging bit in the TIF, but was a good change for other future modifications that we may want to
make to PSC structures, as well as making it a little easier to support the combination of incremental and interned tables.

Added footnote about the name copy_term_nat.

Documentation of copy_term_nat/2.

Implemented copy_term_nat/2.