#20 fix print from command line

[Emile Snyder]

The print-from-command-line functionality was lost when
printing moved to a module based solution.

This patch re-enables printing using the ps print
module from the command line. The dpi is currently
hard coded, but manually changing it doesn't seem to
make any difference to the output.

[Emile Snyder]

[Lauris Kaplinski]

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Thank you! Patch applied.