Warn when netcdf grid is not COARDS/CF-1 compliant
|Category:||-||Estimated time:||0.50 hour|
|Target version:||Candidate for next bugfix release|
When reading a netcdf grid we should add checks to determine if the global Conventions attribute exists and warn if it is not set or not containing COARDS or CF-1. This is because there resulting x,y ranges may not reflect the metadata if these have custom names. As an example, the grid discussed in messagereturns with the wrong x,y info (basically set based on nx, ny instead).