[Patch 2/3] Easter 2016 patches: implement more flexible GPG encryption key selection

[Albrecht Dreß <albrecht dress arcor de>]

Sometimes people change their E-Mail address, or add mail aliases, without adding the proper uid's to their 
public keys.  In this case, it is not possible to send them encrypted messages as the key selection code in 
Balsa completely relies on a key uid which matches the mail address.

With this patch, Balsa will pop up the key selection dialogue containing /all/ keys which may be used for 
encryption in this case.  The user can either select a key, or cancel the operation.  This basically is the 
same behaviour as of Thunderbird.

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