smif DataArray name doesn't always match input name

[tomalrussell]

E.g. in the transport_full_test model in nismod2, in the transport wrapper, with input gva:

current_da = data_handle.get_data("gva")
# current_da.name == 'gva_per_head'

The name matches the source_output name as specified in the dependency, should match the sink_input.