WIP: Resolve L2SDP-49
WIP: is put in front of the title to protect it from merging.
tb_dp_bsn_source_v2 and tb_tb_dp_bsn_source_v2 are working.
the working of "offset_bsn" in "dp_bsn_source_v2.vhd" is checked in the wave-window, but a test needs to be included in tb_mms_dp_bsn_source_v2.vhd (next step)