More profile opts

Merge request for four commits;

1/4: Fixes an error message bug where we're missing a print argument

2/4: Adds --signoff to profiles.
3/4: Adds --inspect-emails to profiles.

4/4: Forces numbering when a cover letter is requested for a single patch for the purposes of separating patch metadata from the patch itself; either way -- if more than one email is sent out, they should probably be numbered.