typo fix; minor cleanup; addition to section 17 
typo fix; minor cleanup; addition to section 17 

Reordered subsections in section 2. Removed "the" from section 8. Added subsection 17.5.
dblock/doppler,sweir27/doppler,dblock/doppler,sweir27/doppler,mzikherman/doppler,sweir27/doppler,artsy/doppler,mzikherman/doppler,artsy/doppler,artsy/doppler,dblock/doppler,artsy/doppler,mzikherman/doppler