Changes since the last upload:
* 001-simplify-imports.diff:
- improve the way modules are imported.
* 002-use-secure-printfile.diff:
- avoid potential symlink attacks and cluttering the user's home.
* 003-test-for-external-commands.diff:
- ensure external commands are available before calling them.
* 004-use-popen.diff:
- replace os.system() with the more secure subprocess.Popen().
* 005-support-lp.diff:
- add support for the lp command in addition to lpr.
* 006-set-print-job-name.diff:
- provide a descriptive name for the print job.
* 007-set-class-name.diff:
- set application name for use by window managers.