Removing more unused/old/untested stuff, and moving tcp_relay to services/.
Documented affix_wrapper_lib.r2py, and included the RepyNetworkAPIWrapper there.

This commit adds in what I consider the missing documentation on why
this wrapper library exists in the Affix framework (and also how
things would work if it would not exist; I'd actually prefer that!).

Now since RepyNetworkAPIWrapper is *also* a wrapper lib, and its previous
filename repy_network_api_wrapper.r2py did not distinguish it as a part
of the Affix framework (rather than, say, the Repy runtime in a typical
@SeattleTestbed install), it has moved into affix_wrapper_lib and
replaced the previous RepyNetworkApiWrapper there.

Once this minimal alpha release branch works, let's discuss whether
we want to keep the wrapping around (no pun intended), or go with the
more verbose yet IMHO easier to understand overriding / closure approach.