Merge branch 'python-work' into maint

Merge branch 'python-work' into maint

* python-work:
  cosmetics: fix various typos and grammaros
  py-compile: '--' and non-option arguments terminate the option list
  py-compile: complain on unrecognized options
  py-compile: normalize error and help messages
  python tests: add "unit tests" on py-compile
  py-compile: the '--destdir' option now accepts a blank argument
  python: run the 'py-compile' script with $(SHELL)