Changelog:
Noteworthy changes in version 1.4.20 (2015-12-20)
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* Reject signatures made using the MD5 hash algorithm unless the
new option --allow-weak-digest-algos or --pgp2 are given.
* New option --weak-digest to specify hash algorithms which
should be considered weak.
* Changed default cipher for symmetric-only encryption to AES-128.
* Fix for DoS when importing certain garbled secret keys.
* Improved error reporting for secret subkey w/o corresponding public
subkey.
* Improved error reporting in decryption due to wrong algorithm.
* Fix cluttering of stdout with trustdb info in double verbose mode.
* Pass a DBUS envvar to gpg-agent for use by gnome-keyring.
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