Devices missing from signatures

[ageorgou]

This is only to keep track of this minor issue so we are not surprised.

The signatures we generate with some versions of pynwb are missing all information about the devices, even though the devices are correctly included in the file. This is because the group for each device only has 3 attributes (namespace, neurodata_type and object_id), all of which are ignored, leading to an empty signature. We also pass the description attribute, but this is not written to the file for some versions (it used to be but then stopped).

This should be fixed with pynwb version 1.3.0, which supports NWB schema version 2.2.2 (bringing back description).

[ageorgou]

This should be fine after updating to 1.3.2 in #65.