Spatial groups refactored as a module

[Russell Adams]

I've cleaned up the code into a module following the instructions on
the wiki. It's posted here:

https://osdn.net/users/rladams/pf/StumpWMSpatial/

I'm open to this migrating to contrib, modules, or elsewhere in the
project.

Installation instructions are on the main page (README).

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Russell Adams                      Russell.Adams@AdamsInfoServ.com
Principal Consultant                          Mobile: 281-846-8329

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