remote UART now activated by RTS

cMIPS/bin/assemble.sh

cMIPS/bin/build.sh

cMIPS/tests/doTests.sh

cMIPS/tests/uartrx.c

cMIPS/vhdl/fpu.vhd

cMIPS/vhdl/io.vhd

cMIPS/vhdl/tb_cMIPS.vhd

cMIPS/vhdl/uart.vhd