duplicity 0.4.9 supports --tempdir (instead of TMPDIR ?)

duplicity 0.4.9 supports the --tempdir command line switch, which may replace the old TMPDIR environment variable usage. This should be looked at a bit.

See http://www.nongnu.org/duplicity/CHANGELOG and https://savannah.nongnu.org/patch/?6356

(from redmine: created on 2008-01-14, closed on 2010-10-12)

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