statistics writer not working in windows

• receiver.py: os.read do not work for sockets in windows. Replacing this with sock.recv (in tcp_reiver) works.
• setup.cfg: "./" do not work for windows. Replacing it with "." works.

Issue mirrored at https://support.astron.nl/jira/browse/L2SS-703

!282 (merged)

Windows won't be fully supported (at least until we separate client from server code?). Best effort work is now in, based on your tips.

closed