Refine options to openelex management command tasks

Make --state option required in most cases.

Fix the options for bake.results_status_json command.

Make sure boolean flag options are identified as such.

Make sure arguments that have default arguments have the defaults also defined in the click.option decorators.

Make filenames parameter of the load.run task a positional argument instead of an option so multiple filenames can be specified using globs on the command line.

Example:

openelex load.run --state ia us/ia/cache/20001107__ia__general__*.csv