* Mostly tightening up the details on the hkp4py example script.
* Also fixed a typo in the LGPL boiler plate text included in all the
other example scripts for the HOWTO.
* Added a script which demonstrates how the groups module works.
* Script generates Mutt/Neomutt crypt-hooks for every group entry in
gpg.conf, including those entries for multiple keys (Mutt handles
that differently).