sorcha-run without any parameters does give intuitive suggestions

[fedorets]

When running 'sorcha-run' the command-line suggestions are not intuitive.

It was mutually agreed that in this case, the output of 'sorcha-run -h' is desired.

#978 is a related issue.

[mschwamb]

That's not quite what was agreed for in the call. We agreed that we can add a bit more detail on the usage line and an error message that reminds the user to use sorcha-run --help if they want a full refresher