Autoinstallers should be more controllable from the command-line

[adehnert]

It would be neat if you could pre-answer a bunch of the autoinstaller prompts by passing options to the relevant scripts-* programs. It isn't obvious that there's any autoinstaller that doesn't ask any questions beyond the obvious common ones, so it might not be quite as easy to totally remove prompts from any of the autoinstallers.

Options I'd like to see include:

• locker (-l)
• path (-p)

Other reasonably common parameters seem to be:

• project name
• username
• password (though, uh, I don't think I want this passed on a command line...)

scripts-remove should also accept options for locker and path (which would conveniently make it expect no user input after execution).

[adehnert]

This was substantially implemented in r1567 (merged to trunk in r1901). It uses environment variables instead of options, and more importantly doesn't address scripts-remove at all.