#3 Possibilty to encrypt the password db for multiple gpg keys

[Wouter Paesen]

This patch adds a gpg_output_id tag in the
configuration file, and adjusts
the encryption routine in such way that the encrypted
database can be encrypted for multiple keys. This way
multiple persons with independant keys can maintain the
database with their own key.

It also fixes a bug in filter.c where the filter string
is allocated as a STRING_MEDIUM, and in options.c where
it is considered to be a STRING_LONG.

[Wouter Paesen]

patch

[Nick Burch]

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The latest CVS now has support for encrypting files to
multiple recipients, so it should be easy to integrate the
rest of your patch.