Okay, libpq++ is moved to GBorg, and all traces of it have been removed

Okay, libpq++ is moved to GBorg, and all traces of it have been removed
from the core repository ... I haven't *moved* the libpq++ files out of the
tree, mainly as we want to keep them in place for past branches ...

Peter, I think I've covered all the files I need, and re-ran autoconf to make
sure the configure file is in place properly ...