Merge branch 'heimkehr' back to master

[David Maus <dmaus@ictsoc.de>]

With the MELPA-packages in sight and as a fix for a reported debian
bug [1] I'd like to merge the development branch 'heimkehr' back into
master.

The branch 'heimkehr' contains two major improvements: A fix for
calling STATUS on selected mailboxes and egh's improved IMAP
search. Both improvements where finished some time ago and I'm running
both against a couple of different IMAP servers without problems for
~2 years now.

Fixing the STATUS bug (=calling STATUS on a selected mailbox) required
a subsequence change to the way WL saves draft messages. The gist of
this change is, that WL obtains the internal message number of a draft
message after it was appended to a draft folder, not before.

For IMAP draft folders this means that, depending on the server
capabilities, WL might not be able to obtain the internal number. This
in turn means that WL won't be able to delete the old draft message
when the draft is updated. I.e. old draft messages might pile up.

If there are no objections I'd like to merge both branches at the end
of this week (~ May, 2nd 2014).

Best,
  -- David

[1] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=735765

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