projtool.pl: new CLI project management tool

projtool.pl: new CLI project management tool

The new projtool.pl script (in toolbox) allows one to do everything
to a project (and more) that can be done via the web UI.

This includes project creation, removal and password changes.

The projtool.pl script can also adopt a bare project located in the
$reporoot hierarchy that is not currently listed in $chroot/etc/group.

Most settings are validated in a manner similar to the web UI.
However, use of the --force option can override most of the checks.

Since projtool.pl subsumes the functionality of the remirror-project.pl
and trash-project.pl scripts, those scripts now just redirect to
projtool.pl but they still work with the same arguments as before.

Signed-off-by: Kyle J. McKay <mackyle@gmail.com>