ENH: report centroid distance if using CNR as a fallback for SNR sphere


git-svn-id: https://www.nitrc.org/svn/cmtk/trunk@4854 42a5c34f-2066-0410-bec5-ba365beb4995
REF: consolidated status flags into a single class


git-svn-id: https://www.nitrc.org/svn/cmtk/trunk@4855 42a5c34f-2066-0410-bec5-ba365beb4995
DOC


git-svn-id: https://www.nitrc.org/svn/cmtk/trunk@4856 42a5c34f-2066-0410-bec5-ba365beb4995