Sort out command line handling a little:
- Export command line argument for project root
- Fix hard-coded argv usage
Update to make the file name included in the coverage macro call relative to the project root.
Still need to sort out the escaping of the pesky back-slashes
Add escaping of the directory name using some borrowed code
Update to specity the project root
Re-built following change to the path mangling of the filename parameter on the coverage macro