Common interface for extracting specific structures from decode files

[Alex Dumitru]

Rasdaman should allow for a common syntax in the decode function that allows to select certain subset structures from the file (e.g. variables in NetCDF, bands in GDAL, fields in GRIB etc).
Some basic example:

select decode(mycol, "NetCDF", "variables=[myVar1, myVar2]") from mycol

Relatively common parameters:

1. dataset subset: variable names, message ids, band ids: can be considered a single category. I'm not sure if GRIB's message ids belongs here actually, as we import them as a dimension rather than bands in rasdaman.
2. spatial subset: lat/lon, x/y/t, etc. subsets, especially relevant for insitu
3. x/y transpose: indicate if x/y should be transposed or is it not relevant (comes up in netCDF and GRIB and has a performance penalty at both decode and encode)

Any others?

[Dimitar Misev]

inv_netcdf supports specifying variable names for example, see #81

[Dimitar Misev]

Indeed we should try to consolidate a common interface for decode:

1. dataset subset: variable names, message ids, band ids: can be considered a single category. I'm not sure if GRIB's message ids belongs here actually, as we import them as a dimension rather than bands in rasdaman.
2. spatial subset: lat/lon, x/y/t, etc. subsets, especially relevant for insitu
3. x/y transpose: indicate if x/y should be transposed or is it not relevant (comes up in netCDF and GRIB and has a performance penalty at both decode and encode)

Any other parameters?