Eliminate another global.
Add some instrumentation.  Regression tests pass...

...but revmap generation is broken.
Rearrange some instrumentation.
More enlightening comment.
Fix a bug in the instrumentation.
Fixed broken -R option.
Get rid of a global. All regression tests pass.
Previous commit was incomplete.  This checks in remauning changes.
Abolish another global. All regression tests pass.
Rename for clarity.  All regression tests pass.
Eliminate another global.
Eliminate yet another global.  All regression tests pass.
Elimiate yet another global.  All regression tests pass.
Remove unused code.
Version bump for release 1.16.