[balsa] (4 commits) Non-fast-forward update to branch replace-libbalsa-mailbox-local-load-messages

[Peter Bloomfield <peterb src gnome org>]

The branch 'replace-libbalsa-mailbox-local-load-messages' was changed in a way that was not a fast-forward 
update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  50aa6ed... Drop libbalsa_mailbox_local_load_messages
  05933d9... mailbox-local: Drop unused private member

Commits added to the branch:

  af7be21... Drop LibBalsaMailbox:is_directory (*)
  aab43d0... Merge branch 'drop-is-directory' into 'master' (*)
  e240187... Drop libbalsa_mailbox_local_load_messages
  625e86e... mailbox-local: Drop unused private member

(*) This commit already existed in another branch; no separate mail sent