bug fix release 0.22.1

[David Bremner]

Hi Team;

A long time ago, David E. fixed a couple of annoying bugs with the emacs
interface, and I added two commits to the release branch with the intent
of making a bugfix point release. Then I got distracted, and never made
that release.  Are there any other small, but important fixes in master
that I should cherrypick? A few candidates are listed below.

David Bremner:
      lib: fix definition of LIBNOTMUCH_CHECK_VERSION
      - this is a pretty embarrassing bug
      
      doc: forbid further operations on a closed database
      - this is not so important, but would let me close a debian
      bug ;)
      
      test: don't use dump and restore in a pipeline
      - these seems like a test failing in the waiting.
      
Mark Walters:
      emacs: show: improve handling of mark read tagging errors
      - not sure if this really fits the small bugfix category.
            
Stefano Zacchiroli:
      notmuch-mutt: use env to locate perl for increased portability
      - I don't use notmuch mutt, but it's a small fix
      
Tomi Ollila:
      test: set LD_LIBRARY_PATH early and keep its old contents
      - this seems like it could be annoying

      test: test_python: set PYTHONPATH to the python execution environment
      - I'm less sure about this one

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