Squashed commit of the following:
    commit 947842f9
    Date:   Thu May 8 18:36:14 2014 +0200
      final fixes before merging AutoSendEncrypted branch into the master
    commit 87dc3175
    Date:   Tue May 6 23:12:53 2014 +0200
      finishing first version of auto-send-encrypted and other sending stuff
    commit 17e0d58d
      persist encryption model
    commit 8dd0f8d2
    Date:   Mon May 5 23:41:56 2014 +0200
      try out convenient/manual settings for sending preferences
    commit 7fbae3e5
    Date:   Fri May 2 09:22:06 2014 +0200
      try to find valid keys inside enigmail
    commit 744fb1d3
      simplified accepted keys stuff
    commit 0d18ac6e
      option to accept only poersonal keys
    comm...