casm update does not default to using 'MASTER' selection. Selections for casm rm also not working as expected

[jli5373]

The documentation from casm update -h indicates that casm update should default to the MASTER selection list, but unless I explicitly input casm update -c MASTER, it seems to attempt to update either 'ALL' or 'CALCULATED', not completely sure from my project, which is not the expected behavior.

Also, I think this affects casm rm as well since I tried to run casm rm --names "my_config_name" or casm rm -c MASTER and it instead tried to remove all the configurations in my casm project instead of just the selected one.

[bpuchala]

Thanks for the comment, it will help us improve update / import.