mq: make qsave implementation more explicit
It wasn't obvious from the code how qsave mocked around with .hg/patches and
.hg/patches.? and what was going on.
This makes it more explicit so it will survive future refactorings.
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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