GitLab

- Don't explicitly install virtual packages provided by GHC
  (and note this in the list).
- Add minimum versions to several packages.
- Fix the configuration flag for the monitoring daemon.
- Add a note that additional packages installed using cabal should go
  only after the ones provided by the user's distribution.
Signed-off-by: Petr Pudlak <pudlak@google.com>
Reviewed-by: Klaus Aehlig <aehlig@google.com>