Eliminate tabling on non-existent predicate.
Add numbervars to make test more stable.
Cleaned up some very obscure code on passing file names to load_object_file.
Added a def for use with incrementa, abstract
Now supporting incremental, abstract(0)
took out unused export.
test for incremental, abstract(0)
Clean up load_object_file, motivated by handline immutable better.
To simplify communication of not-loaded due to immutable file back to loader.P.
Removed a spurious character.
