XSB Src (SVN)-old

Finished update of table abolish/gc routines by making gc mark
check delay list (didn't do this last night because I wanted to
be fresh). Also did some minor code refactoring and optimization
for these routines.

Minor updates for documentation of tries and table abolishes.

Extended (almost) all the marking routines for tabled predicates
so that subgoals in the heap delay list are checked. This rather
obscure bug caused a crash in a Flora program for defeasible
logic. I'll try to finish that part tomorrow.

The problem was that space was reclaimed for a table T that had a
delay element in the heap pointing to it. When the answer with
the delay element was added, the engine tried to adjust the
backpointers for T and crashed.

Also made some minor ajustments for efficency to some of the
marking functions. And I changed abolish_table_info to the
clearer abolish_all_tables.

ABOLISH_TABLE_INFO -> ABOLISH_ALL_TABLES

Took out explicit definitions of undefined.

Fixed dumb typo in switch to abolish tables transitively vs singly.

undefined/0 now standard.

Added filter for .dylib

took out def of undefined (undefined/0 now standard).

Defining undefined.