Genie:  Remove Genie dependency from PairedSocket
Genie:  sock -> that in PairedSocket
Genie:  Reorder pairedsocket methods to ease patch
Genie:  Rewrite PairedSocket without derived class
Genie -> relix:  Move PairedSocket
relix:  {api/new_ => socket/}paired_socket.hh
relix:  Pass plain stream& to new_paired_socket()
Merge branch 'pairedsocket-refactor'