Merge branch 'master' into L2SDP-431

...far2_unb2b_sdp_station/lofar2_unb2b_sdp_station.fpga.yaml

...far2_unb2b_sdp_station/lofar2_unb2b_sdp_station.mmap.gold

...unb2b_sdp_station/lofar2_unb2b_sdp_station.mmap.qsys.gold

...2b_sdp_station/quartus/qsys_lofar2_unb2b_sdp_station.qsys

...b2b_sdp_station/src/vhdl/mmm_lofar2_unb2b_sdp_station.vhd

...dp_station/src/vhdl/qsys_lofar2_unb2b_sdp_station_pkg.vhd

...tions/lofar2/doc/prestudy/station2_sdp_hdl_components.txt

applications/lofar2/doc/prestudy/station2_sdp_m_and_c.txt

applications/lofar2/doc/prestudy/vhdl_explained.txt

applications/lofar2/images/images.txt

applications/lofar2/images/unb2b_minimal-rce6b96eed.tar.gz

...ries/unb2b_board/src/vhdl/unb2b_board_peripherals_pkg.vhd

...ries/unb2c_board/src/vhdl/unb2c_board_peripherals_pkg.vhd

doc/erko_hdl_design_article.txt

libraries/base/common/src/vhdl/common_counter.vhd

libraries/base/common/src/vhdl/common_pkg.vhd

libraries/base/common/src/vhdl/common_reg_r_w_dc.vhd

libraries/base/common/src/vhdl/common_str_pkg.vhd

libraries/base/dp/dp.peripheral.yaml

libraries/base/dp/hdllib.cfg