Fix gcov call
What has been done:
- gcov points to gcc7, so we have to call gcov-8 to get gcc8
Should there be updates to the changelog?
- Yes, done
Should the patch number in parameters.F90 be updated?
- Yes, done
Should there be updates to the website?
Compilation and testing:
- Tested with intel?
- Tested with -rcheck?
- Tested with -fbatch?
- Tested with PCM?