PDF: use system temp dir and set TEXMFOUTPUT.

Previously the temp directory was created inside the working
directory, so that programs like epstopdf.pl would be allowed
to run in restricted mode.  However, setting TEXMFOUTPUT allows
these programs to run in the tmpdir inside the system temp
directory.

This is a better solution than cd51983.  Using the system
temp dir prevents problems when pandoc is run inside a synced
directory (e.g. dropbox).

Partially addresses #1192.

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