The value of _diffrn_data_frame.details should give a
description of special aspects of each frame of data.
This is an appropriate location in which to record
information from vendor headers as presented in those
headers, but it should never be used as a substitute
for providing the fully parsed information within
the appropriate imgCIF/CBF categories.
Normally, when a conversion from a miniCBF has been done
the data from '_array_data.header_convention'
should be transferred to this data item and
should be removed.