Resolve L2SDP-492 + L2SDP-581

Closes L2SDP-492

See merge request desp/hdl!218

No functional change. Use short index variables names in capitals, to ease...

Closes L2SDP-601

See merge request desp/hdl!219

Added tb_tb_lofar2_unb2c_sdp_station_bf.vhd to verify the beamlet subband select, BF sum and dual pol beamlets.

No need to pipeline bf_weights_y_sosi_arr, because dp_deinterleave_one_to_n expects all inputs to be aligned.

No functional change. Use short index variables names in capitals, to ease recognizing them as (loop) indices.

Resolve L2SDP-663

Closes L2SDP-663

See merge request desp/hdl!217

Resolve L2SDP-661

Closes L2SDP-661

See merge request desp/hdl!216

MM readback the currently active crosslets info, instead of the initial MM...

Closes L2SDP-562

See merge request desp/hdl!210