Fix a symptom-less error in tracer.c, and lots of other suggested fixes noted from Yhg1s.
Fix a symptom-less error in tracer.c, and lots of other suggested fixes noted from Yhg1s.

7WebPages/coveragepy,larsbutler/coveragepy,nedbat/coveragepy,jayhetee/coveragepy,hugovk/coveragepy,jayhetee/coveragepy,nedbat/coveragepy,blueyed/coveragepy,7WebPages/coveragepy,hugovk/coveragepy,jayhetee/coveragepy,nedbat/coveragepy,blueyed/coveragepy,blueyed/coveragepy,blueyed/coveragepy,larsbutler/coveragepy,jayhetee/coveragepy,blueyed/coveragepy,7WebPages/coveragepy,hugovk/coveragepy,larsbutler/coveragepy,jayhetee/coveragepy,nedbat/coveragepy,hugovk/coveragepy,larsbutler/coveragepy,larsbutler/coveragepy,hugovk/coveragepy,nedbat/coveragepy,7WebPages/coveragepy