Behave more like a UNIX tool

[ole-tange]

You clearly know pnmtools. One of the great things about pnmtools is that it can be used in a pipe.

I suggest changing pdf2odt so this is possible:

    cat example.pdf | pdf2odt | tee example.odt | wc

This should effectively run something like:

    cat example.pdf |
      (cat > tmpfile.pdf; pdf2odt --pdf tmpfile.pdf tmpfile.odt; cat tmpfile.odt; rm tmpfile*) |
      tee example.odt | wc

but should be written directly in Python.

    pdf2odt example.pdf

should effectively run:

    pdf2odt --pdf example.pdf example.odt

    pdf2odt example.pdf - | wc

should effectively run:

    (pdf2odt --pdf example.pdf tmpfile.odt; cat tmpfile.odt; rm tmpfile.odt) |wc

but written in Python