Add total-power monitoring function

	modified:   Makefile
	modified:   VDIF_store.c
	new file:   bitDist.c
	new file:   bitPower.cu.bak
	modified:   cpg_power.c
	modified:   cpg_spec.c
	modified:   cuda_fft_xspec.cu
	modified:   cuda_polaris.inc
	modified:   polaris_start.c
	modified:   shm_VDIF.inc
	modified:   shm_power_view.c
	deleted:    bitPower.cu