[PATCH] Option to show/edit only metadata

[Pelle Nilsson]

Hello!

I use the format suggested on the web site to store metadata with the
passwords, such as URL and username. I found it unsatisfactory that I
could not view or edit this metadata without also showing password
itself on the screen for all by-standers to see. A better workflow
would be to show only the metadata and then copy the password itself
to clipboard (with existing -c option). This patch therefore adds a
-w/--without-password option to show and edit commands.