XSB Src (SVN)-old

1) Fixed dynamic as so that it is accepted as an executable directive.

2) Added 'incremental' as a predicate property.

3) Minor change to use_incremental tabling (won't core-dump on a non-comma list)

added test case for incremental tabling where no clauses are initially
present for a predicate declared as incremental in a file.

Fix to an incremental tabling bug in which incremental tabling was not
performed properly if a predicate was declared incremental and dynamic
in a file, but no clauses were present for the predicate.

Another missing declaration for aggregate transformation, this time for delete_return.

Fixed bug in handling of delimiters.

Added import of copy_term when generate aggregate transformation.
Don't know why this bug didn't show up earlier.

added incr_assert/3

Another small update to delete_branch to support backtrackable updates
and trie_unintern_nr.

Made delete_branch check the BTNs that it deallocated, to make sure
that it wasn't deallocating an already-deallocated BTN. The foregoing
situation arose when using trie_unintern_nr and reclaim_unintern_nr by
the storage module for backtrackable updates.

Exported do_the_load as load_object_file so it can be used to ensure
exactly what file is loaded, bypassing the library_directory paths,
when necessary.