This change allows for a user to request that the RAOB is
"Recalculated." This can be required if an earlier user of the
site requests the observation before the entire observation is
available. This results in an incomplete observation being cached.
Recalculation requires additional resources, so the default is to
not recalculate.

This is a partial test of recalc=True in WyomingUpperAir.request_data.
Since recalculation only has an appreciable effect based on the
unpredictable state of the Wyoming cache, this test only checks if
including the recal=True breaks the request.