[scripts] Added the Python setup script for programming/initialization.

This script will ultimately be replaced by a TBS plugin that will
automatically program the FPGA, initialize all register from a config
file, calibrate ADCs, synchronize boards, etc.
[scripts] Added the catchdata.py script.

This script catches the visibility data packets over 10 GbE
from our ROACH2 correlator boards and spits it out to a list of
subscribers over TCP/IP.

This will ultimately be replaced by a program that sends the
visibilities over RPC to the SMA's dataCatcher and dataSaver
servers.