Print hostname

Prints the name of the host at runtime for each MPI rank when the verbosity level is set to 2 and the name of the host by default when MPI is not activated.

Added 2 commits:

• a0b3a48c - Don't mention Rank when running in non-MPI mode
• 6e8be9b9 - Remove debugging code

Removed a piece of debugging that crept in and a slight refactor so that we don't mention Ranks in non-MPI mode. Other than that looks good to me.

Status changed to merged

mentioned in commit a4cb085a