Infer dimensions

[stefsmeets]

This crashes when constructing the dataset:

variables = 'zeff', 't_e'
dataset = h.get_variables(variables=variables, ids=ids)

with KeyError in xarray:

self = <xarray.Dataset>
Dimensions:  ($rho_tor_norm: 101)
Dimensions without coordinates: $rho_tor_norm
Data variables:
    z...loat64 1.761 1.761 1.761 ... 1.761 1.761 1.761
    t_e      ($rho_tor_norm) float64 7.566e+03 7.564e+03 ... 302.3 240.3
name = 'rho_tor_norm'

    def _construct_dataarray(self, name: Hashable) -> DataArray:
        """Construct a DataArray by indexing this dataset"""
        from xarray.core.dataarray import DataArray
    
        try:
>           variable = self._variables[name]
E           KeyError: 'rho_tor_norm'

It would be useful if imas2xarray would recognize 'time' and 'rho_tor_norm' as missing variables and automatically include them.

[stefsmeets]

This is happens when squashing the data.