[Csync2] tempdir patch

[Art -kwaak- van Breemen]

I've added a config option called tempdir, which allows to set a
default tempdir.
Furthermore, the tmpfile code is rewritten to use tempnam, which
means it will adhere to the TMPDIR= convention.
-- 
A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?
A: Top-posting.
Q: What is the most annoying thing in email?
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