[PATCH] update notmuch and python bindings

[Troy Sankey]

This patchset updates notmuch from 0.21 to 0.22.1, adds python3 bindings, and
updates the existing python2 bindings.  The notmuch upgrade was not necessary
for adding the python3 bindings (my primary goal) but I'm throwing it in
because the NEWS file does not indicate any breaking change.  Also my own
experience upgrading from 0.21 to 0.22.1 was problem-free.

Troy

0003-gnu-python2-notmuch-Update-to-0.22.1.patch
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0002-gnu-Add-python-notmuch.patch
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0001-gnu-notmuch-Update-to-0.22.1.patch
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