Remove output_format == 4 option (hdf and/or netcdf)? #276
Description
When re-writing all the valout.f90 files for #275, I noticed that output_format == 4 sometimes means hdf and other places means netcdf although I don't think either works. In particular we decided at some point thatnetcdf format is not appropriate for AMR data so we should not support that at all.
@mandli, does the hdf option work at all? Several places an valout.f90 files it stops with an error message if output_format == 4, so I suspect not.
Can I just remove all this code to clean up the files?
Same question for GeoClaw.