Install gpg2 as gpg

[Leo Famulari]

There was discussion of installing the gnupg-2.1 binaries 'gpg2' and 
'gpgv2' as 'gpg' and 'gpgv' on the 'Trustable guix pull' thread [0].

If we do this, it will become impossible to install gnupg-1 and 
gnupg-2.1 in the same profile, due to collisions of 'gpg' and 'gpgv' and 
their man pages. There are no collisions without this change.

It might also require users to update their scripts.

On the other hand, Werner recommends the change.

The configuration option does not exist for gnupg-2.0.

Discussion welcome!

[0]
http://lists.gnu.org/archive/html/bug-guix/2016-06/msg00035.html

0001-gnu-gnupg-2.1-Install-executable-as-gpg.patch
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