Added additional test for min and max equivalency before mapping values into an array in nrrdHistoEq.  Fixes a case with unu heq -b 4000 -s 1.  When -s 0 was used, the proper error was generated.
Added additional test for min and max equivalency before mapping values into an array in nrrdHistoEq.  Fixes a case with unu heq -b 4000 -s 1.  When -s 0 was used, the proper error was generated.


git-svn-id: 9e9401559e51101c165cdce4d49b411eb20436ed@1099 3d70eeeb-363e-0410-a505-8a46323a89f2

BRAINSia/teem,Slicer/teem,Slicer/teem,Slicer/teem,Slicer/teem,BRAINSia/teem,BRAINSia/teem,BRAINSia/teem,Slicer/teem,BRAINSia/teem