patchbomb: always use message-id of first patch for series-id
This currently has the side effect that the 0 of N message has no
series-id. This won't matter for Mercurial's own use, but may be
undesirable for other projects depending on their workflow.
The way the header is inserted is intentionally a little funny to make
the test expectation diff easier to review.
Mercurial
=========
Mercurial is a fast, easy to use, distributed revision control tool
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$ make # see install targets
$ make install # do a system-wide install
$ hg debuginstall # sanity-check setup
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Running without installing:
$ make local # build for inplace usage
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See http://mercurial.selenic.com/ for detailed installation
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