Makefile.am:
- Replace 4 hardcoded parallel commands with loop over FUNC_TEST_GROUPS
- Easy to extend by adding group numbers to the variable
functionaltests.c:
- Remove test counts from comments (prone to becoming outdated)
- Restore previous comment style with === separators for readability
- Replace switch with groups[] array structure for extensibility
proftest.h:
- Fix comment to describe current state, not the change made
CONTRIBUTING.md:
- Document test groups and parallel execution commands
- Add instructions for adding new test groups