Bad shape for reflections

[maffettone]

Reflections get's stored as a list of 3 membered lists, rather than an nx3 array. This raises data retrieval errors in Tiled and Databroker, as the shape in reflections.describe() is (n) rather than (n, 3).

databroker.mongo_normalized.BadShapeMetadata: For data key tardis_reflections shape (2, 3) does not match expected shape (2,).
See /var/log/bluesky/bluesky.log for the full traceback.

In [28]: tardis.reflections.describe()
Out[28]: 
{'tardis_reflections': {'source': 'PY:tardis._reflections',
  'dtype': 'array',
  'shape': [2]}}

I imagine this could be fixed by changing to ArrayAttributeSignal.

reflections = Cpt(ArrayAttributeSignal, attr="_reflections", doc="Reflections")

hklpy/hkl/diffract.py

Lines 179 to 183 in 4bc42df

	reflections = Cpt(
	AttributeSignal,
	attr="_reflections",
	doc="Reflections",
	)

Tagging @ambarb for visibility.

[ambarb]

we opted to remove reflections from the recorded metadata since reflection_details is more informative. just wanted to report the issue as we are unsure of the use of reflections