SP main branch will be unstable for "awhile"

[Cantor, Scott]

I'm sure it affects nobody, but FYI the main branch of the cpp-sp project will be unusable for a while.

I'm starting the process of tearing it all down to the bare metal to remove all the code that's going away so the process of constructing the V4 SP agents can start.

The current branch is on maint-3 now if anyone needs it for some unlikely reason.

-- Scott