Added recognition of index(_) in table-as set.
compile lists in sysmod.
Eliminate single-use variable warnings.
Straighten out a nameing conflict.
Added -f flag to rm, to quiet.
minor cleanup of 't not'.
Test one more minor thing.
Simple cleanup: Eliminate tabling of nonexistent predicate.
Eliminate tabling on non-existent predicate.
Add numbervars to make test more stable.
