Description:
- Fix #48, #53
- Fix reported info metrics
- Filter options, exclusion marker scanning can now apply during combine operations
- Allow LCOV_EXCL markers to filter function coverage
- Shift exit codes to start at 3 (slight break in backwards compatibility if switching on exit code values)
- This is because 1-2 have special meaning for a lot of shells
- Add new exit code (6) for exclusion scan failure