Be less verbose with program options.

Don't print the list of program options by default when running the
Gromacs binaries.  The command line printed as part of the startup
header should provide any diagnostic value there is to this output.
Replace the previous -quiet option (that disabled this output) with
a -verbose option that enables this output again.  Left the mostly no-op
-quiet option there (there is still a special case of -quiet -h used by
gmx_tune_pme), because it will get new use shortly.
Removed the hidden -verb option whose value wasn't used.

Related to #1209.

Change-Id: I9730e1eb08a2ee35d26fd603f48e89f561dee50a