More robust validation

This MR makes the efficiency calculation in the Allen validators use double precision instead of single precision. This solves instabilities observed in !767 (closed).

added only GitLab CI label

added RTA label

assigned to @raaij and @dovombru

mentioned in merge request !655 (merged)

@dovombru @raaij is this ready to be merged?

approved this merge request

merged

mentioned in commit 7a539fec

mentioned in issue Moore#390 (closed)

mentioned in merge request !764 (merged)