dataloader: added unit tests to start systematically checking sector averaging computations.
dataloader: added unit tests to start systematically checking sector averaging computations.

SasView/sasview,SasView/sasview,lewisodriscoll/sasview,SasView/sasview,lewisodriscoll/sasview,lewisodriscoll/sasview,SasView/sasview,SasView/sasview,SasView/sasview,lewisodriscoll/sasview,lewisodriscoll/sasview