Fix bug in pathnames when using --fullcheck (#201)

* Yet another weird round of having to repeatedly accept the same changes which git / VS Code are marking as in conflict.
Annoyingly, this seems to have introduced a bug as well.

* Fixing issue with external runners not establishing properly.

* Fixing an error that seems to have crept in during merging main and resolving clashes. But looking at it, I really can't fathom out 'how'

* Where do these line length errors in the linter(s) come from - I haven't edited this file...

* quick "improvement" to the error reporting in one of the tests

* Why am I constantly having to re-impliment fixes/tidying I'm sure I've done before.

* And now ruff_format wants to change them back again...

* Fix issue with "TLD" being repeated for paths when using --fullcheck

* Undoing auto formatting again as github CI doesn't agree with it (picard.gif)

Author: r-sharp

script_umdp3_checker/umdp3_conformance.py

@@ -590,7 +590,7 @@ def get_files_to_check(
     """
     if full_check:  # Override to check all files present.
         repo_path = Path(path)
-        all_files = [f for f in repo_path.rglob("*") if f.is_file()]
+        all_files = [f.relative_to(path) for f in repo_path.rglob("*") if f.is_file()]
         if print_volume >= 1:
             print("Full check override enabled.")
         if print_volume >= 3: