Add long flags (suggestion)

[silverhook]

I know it is a matter of preference, but some people (like me) prefer long flags over short ones, so they can better remember what they do, especially with auto-completion being more and more common in shells.

I suggest the following pairs:

-a --attach
-A --attach-or-create
-c --create
-n --new
-r --read-only
-l --lowest-priority
-f --force
-e --detach-key
-v --version