Add power monitor function

	modified:   Makefile
	new file:   bitDist2Power.c
	new file:   cpg_power.c
	modified:   cpg_setup.c
	modified:   cpg_spec.c
	modified:   cuda_fft_xspec.cu
	modified:   cuda_polaris.inc
	modified:   polaris_start.c
	modified:   shm_k5data.inc
	new file:   shm_power_view.c
	modified:   shm_spec_view.c
	modified:   timesystem.c