Fixing documentation for Find Average Orientations
Updating the named constants in the DREAM3D namespace to remove 'FieldEulerAngles' and 'CellEulerAngles' and just call them 'EulerAngles' instead. This also forced an update to the macros.
Making error messages more clear when DataArrays that are requested from the Data Container classes do not match type, size or number of components to the filter that is doing the requests.