* Swapped file block and directory block in list_db. This was so that roots work but don't get listed for files.
* Added ability to specify 'LastModified' and 'LastChecked' columns as arguments to gen_schema_1().
* Finished testing listdb with 1 file target.
* Removing TODO.txt, since issue list on GitHub is sufficient.
* Testing list subcommand with multiple targets complete.
* Tweaked formatting of list subcommand output.
* Updated list subcommand unit tests.
* Added list subcommand unit test for invalid target.
* Added list subcommand unit test for target with wild cards.
* Added list subcommand unit test for --use-root option.
* Added list subcommand unit test for --root-prefix option.
* Added list subcommand unit test for --minimal (and -m) option.
* Added list subcommand unit test for --expanded (and -e) option.