[PATCH]show: add line option + changed error message

[Ruven Salamon]

Hi,

This is my first time sending in a patch through mail (I'm more used to
pull-requests) so I hope I don't mess up anything.

I made two changes:

When a user wants to access extra information stored in a pass file by
using the line-number argument, it at least implies they're not
accessing a password. The previous text assumed they do.
The text now also reflects the different output possibilities.

and

Added a '--line', '-l' option to the show command to allow the user
to access extra information stored using '--multiline', '-m'.
This way they don't have to print out the password alongside the
needed information or place the needed line onto the clipboard first.
Added information about the option in the manpage.
Added a test for this option to the show tests. (test passes)


Hope they are of some use!

Ruven Salamon.

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