Fix regression on fields-of-interest as much as possible.

Fix regression on fields-of-interest as much as possible.

Since the new summary configurations normalize summary column
values, it's become impossible to construct contacts from summary
columns, however this is untrue for the UID & REV fields which are
not normalized, for those fields it's still possible to construct
contacts from the summary (and UID / REV is anyway the main known use
case of the fields-of-interest feature).