Instead, use a personal global gitignore file and ignore whatever
files your editor/IDE/OS generates there.

Also introduced nicer shutdown when pressing Ctrl+C

It can register with the Flamenco Manager, but nothing
else. It does save its secret & worker ID in a config
file, though.

Currently regular users are not allowed any access (this is temporary
until a proper access scheme is implemented). Admins can do anything,
and Flamenco managers have limited access.

As of yet unused, but that won't take long.