python-3 compatible example/cups.py, and associated documentation imported from the wiki (Closes: #54)

* Add README.cupsfs.md

Imported from Wiki: Initial Home page

Co-authored-by: Elan Ruusamäe <glen@delfi.ee>

* Extract cups.py to example directory

* Add python3 fixes

* Apply 2to3 fixes

* Format and re-indent to satisfy flake8

* Avoid star import as unable to detect undefined names

* Fix py3 issues in README.cups.md

* Apply spelling fixes to README.cups.md

* Cleanup un-needed trailing whitespace

* Fix &gt; in README.cups.md

It's rendered raw, no need to escape ">"

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Co-authored-by: Nikolaus Rath <Nikolaus@rath.org>

Author: glensc