health-services-research.csl - Complete Overhaul

Complete overhaul of health-services-research.csl.  It so is a
derivative of the "Harvard Reference format 1" author-date style by
Julian Onions
health-services-research.csl - add missing macro and one tweak
Merge pull request #472 from kkranker/master

I overhauled health-services-research.csl - please pull these edits in.  Thanks.