-Added gen_hex_files_composite_signals.py to create (composite) complex sine

 waves and write them to HEX files used by the block gens;
-Added dp_stream_rec_play to apertif_unb1_correlator to record the WPFB output;
-Added tc_wpfb_src_out_arr.py to read and plot the recorded WPFB output;
 . Not working yet - the WPFB output does not resemble s spectrum.
-Commented out the correlator as the WPFB is now the main DUT.

Happy holidays!