Merge remote-tracking branch 'origin/feature/8660_unmangle_WorkspaceGroup'
Merge remote-tracking branch 'origin/feature/8659_SortDetectors'
Merge remote-tracking branch 'origin/feature/8661_unmangle_IPeaksWorkspace'
Merge remote-tracking branch 'origin/feature/4394_diffusion_sphere'
Changed to use atan2 rather than atan. refs #8663
Merge branch 'feature/8663_solidangle' into develop