Updated rTwoWMul to use arria10 multipliers if available and updated sdc

...r2_unb2b_sdp_station/quartus/lofar2_unb2b_sdp_station.sdc

...r2_unb2c_sdp_station/quartus/lofar2_unb2c_sdp_station.sdc

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

libraries/dsp/rTwoSDF/src/vhdl/rTwoWMul.vhd