Possible changes to GVRS file format to support multiple data sets

[gwlucastrig]

I am thinking about enhancing the GVRS file format to support multiple data sets (including rasters with different data types, sizes and resolutions) in a mannr similar to HDF5 (NetCDF) and TIFF. This action would break compatibility with existing file products. So I need to figure out how to proceed without breaking code for existing users.

If you are currently using GVRS, I invite you to post a quick note telling me about how you use it. That information will help me plan future work more effectively.

I also welcome suggestions for new features and how the code could make the transition to the new format without too major an impact on existing users.