Created new library common_mult for multiplier components.

libraries/base/common/hdllib.cfg

libraries/base/common_mult/src/vhdl/common_complex_mult.vhd

...ies/base/common_mult/src/vhdl/common_complex_mult_add.vhd

libraries/base/common_mult/src/vhdl/common_mult.vhd

libraries/base/common_mult/src/vhdl/common_mult_add2.vhd

libraries/base/common_mult/src/vhdl/common_mult_add4.vhd

...aries/base/common_mult/tb/vhdl/tb_common_complex_mult.vhd

...mmon_mult/tb/vhdl/tb_common_complex_mult_add_parallel.vhd

...mmon_mult/tb/vhdl/tb_common_complex_mult_add_pipeline.vhd

libraries/base/common_mult/tb/vhdl/tb_common_mult.vhd

libraries/base/common_mult/tb/vhdl/tb_common_mult_add2.vhd

libraries/base/common_mult/tb/vhdl/tb_tb_common_mult.vhd