Compute-pi reduction examples are a mess

The example code associated with example/prog-guide/compute-pi-multi-examples.cpp is a confusing mess.

It #includes eight different files implementing a naive sum reduction, all of which are poorly named and poorly commented. These files used to be described with accompanying prose in the Programmer's Guide, but those guide sections have since been removed/rewritten, leaving these orphaned examples lacking necessary context.

I think this example code still has some value, but it needs a cleanup to avoid confusing users.

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