[WIP] update mac configure script and add messaging about common port forwarding issue

update mac configure script and add messaging about port forwarding until we maybe use a better solution like how libtorrent does this, or RPC & UDP like this https://github.com/bmuller/rpcudp to avoid most port forwarding issues.
to actually address your point here, brew install python does install it.  if you actually went and unlinked it with brew, i'm not sure what brew doctor would say -- prob nothing.