Add support for ROMS-CoSiNE 2009 and 2010 datasets

[jjr8]

The original ROMS-CoSiNE dataset run from 1991-2008 and is offered at the URL  http://viz.clusters.umaine.edu:8080/thredds/dodsC/pacific/1991-2008. But the ROMS-CoSiNE team has since made available data for 2009 and 2010 at new URLs specific to those years ( http://viz.clusters.umaine.edu:8080/thredds/dodsC/pacific/2009 and  http://viz.clusters.umaine.edu:8080/thredds/dodsC/pacific/2010). The MGET ROMS-CoSiNE tools should be enhanced to allow the user to provide those URLs instead of the default 1991-2008 one when the user wants to access the 2009 and 2010 datasets.

[jjr8]

Implemented in MGET 0.8a27.