Display chroot names and details

Add option '-a' to operate on all chroots and '-l' to list croutonversion details.
Thanx again, I think I've got the misdirections fixed and in accordance
with the 'general practice' guidelines you mentioned above now.

Thanx for all your help with this, it's very kind of you to take time out
to get me pointed in the right direction. It was a little scary in the
beginning 'cause I've never attempted a 'pull request' but I do a lot of
(ugly) scripting so I thought I'd try it. The github site is still a little
intimidating to me, I get lost with the branches, pull requests, line
notes, etc. and knowing exactly where to do the editing. With practice
though, I'll probably figure it out enough to get by.

-DennisL