prevent unnecessary recalculation of transformations
prevent unnecessary recalculation of transformations

The GUI splits the array of Q values into chunks - we should not recalculate the transformed coordinates for each one - so there is now a saved value that is reset to None when the data or rotations are changed.

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