Fixed caching behavior in work queue: all files are cached upon request.
Previously, renamed files were not cached, due to deficiencies in the
worker cache structure, but this was fixed in the most recent worker cleanup.
Fixed missing case: caching flag must also be set in submit_simple.
Merge pull request #610 from cooperative-computing-lab/makeflow-wq-caching-bug

Fixed caching of renamed files in makeflow -T wq