[Mitgcm-support] Mdsio and cg2d verbosity

[mitgcm-support at dev.mitgcm.org]

Hi Patrick,

 How about controlling the cg2d and mdsio non-error messages to only
come out when debugMode is on?
 No need for a new flag then. If anyone complains we can switch
debugMode to debugLevel and have
 them appear for debuglevel=standard (default) but not for
debuglevel=silent etc... 

 I think this would be better than a new flag. 

Chris