LALInferenceLikelihood.c: Fix bug in calculating mean time during
margtime integration. Also add comments and fix indentation in a few
spots

Conflicts:
	lalinference/src/LALInferenceLikelihood.c
LALInferenceLikelihood.c: Fix margtime time-shifiting and FFT so *all* likelihoods should be working now.

Conflicts:
	lalinference/src/LALInferenceLikelihood.c
Fix undeclared variable in LALInferenceLikelihood.c