Add sftof file option to sea ice

[acordonez]

1. Adds support to use model sftof or sftlf file for land/sea mask. File should use 0-1 for land sea fraction but the driver will attempt to identify when the mask uses 0-100 and convert it to 0-1. There is also an option to use no land/sea mask.
2. Makes some minor fixes to figure appearance.
3. Adds support for 360 day calendar (needed for CMIP3).
4. Cleans up units adjustment tuples read from command line.
5. Add annual mean maps.
6. Updates the netcdf option: Files are written for use in generating figures, but if netcdf=False then the netcdf files are deleted at the end of the run.