added busError exception

cMIPS/include/cMIPS.h

cMIPS/include/cMIPS.ld

cMIPS/include/cMIPS.s

cMIPS/include/start.s

cMIPS/tests/FPU_m.c

cMIPS/tests/busError_d.expected

cMIPS/tests/busError_d.s

cMIPS/tests/busError_i.expected

cMIPS/tests/busError_i.s

cMIPS/tests/doTests.sh

cMIPS/tests/mmu_context.s

cMIPS/tests/mmu_refill.s

cMIPS/tests/mmu_refill2.s

cMIPS/vhdl/core.vhd

cMIPS/vhdl/exception.vhd

cMIPS/vhdl/io.vhd

cMIPS/vhdl/packageExcp.vhd

cMIPS/vhdl/packageMemory.vhd

cMIPS/vhdl/tb_cMIPS.vhd

cMIPS/vhdl/units.vhd