Corrects a variable typo which leads to some false positives

Allows passthrough of all files before trigger error code, to allow to see all files which don't obey header format.

Allows checking of individual files.

Eoin Clerkin authored 3 years ago and Florian Uhlig committed 3 years ago

Ensures that modified .cpp, .C and .h files follow basic licence header guidelines.

Check line 1 for a copyright declaration with correct numerial and character placements for a date followed by institute and city.
Check line 2 for SPDX licence identifier.
Check line 3 for author and committer information.