* Add code-coverage make target and github actions workflow
* Upload coverage to coveralls
* Add coverage badge to readme
* Fix some test makefiles to correctly propagate flags
Adjusted all of the source code to point to the header files in their new
locations. Adjusted the makefiles for the header locations as well.
Added .gitignore files in the test directories to ignore test object code.
Changed all header file once include variables to follow the same naming
convention and not start with any underscores. Also deleted old
incorrect copyright notices. Also removed $Id: tags from all files.
Fixes#14. Fixes#22.