Rename cvlib.py to worklog.py, and split out the main drivers

This is a little bit cleaner and better-named, I think.
worklog.py: forgot to remove execute bit
wltool: better usage help
wltool: fold in update-adscites.py functionality
example: don't use templates/ subdir; not needed and complicates things

We do have to be slightly less cavalier in 'make clean', though.
README.md: updates
README.md: finish documenting pubs for now