ENH: Implemented "!=" operator

Change-Id: Ib48a8d237fde19fafee96be85fd802b2f7de36a2

Filtering/vtkAMRBox.cxx

@@ -41,8 +41,8 @@ vtkAMRBox::vtkAMRBox(
     int ihi,int jhi)
 {
   this->BuildAMRBox( ilo,jlo,0,ihi,jhi,0);
-  assert( "post: Dimension expected to <= 2" &&
-    ( (this->GetDimensionality()==2) || (this->GetDimensionality()==1) ) );
+//  assert( "post: Dimension expected to <= 2" &&
+//    ( (this->GetDimensionality()==2) || (this->GetDimensionality()==1) ) );
 }
 
 //-----------------------------------------------------------------------------
@@ -1006,8 +1006,13 @@ bool vtkAMRBox::HasPoint( const double x, const double y, const double z )
 //-----------------------------------------------------------------------------
 bool vtkAMRBox::operator==(const vtkAMRBox &other)
 {
-  // TODO: fix this to check for equality of meta-data as well
-  if ( this->Dimension!=other.Dimension)
+  // TODO: fix this to check for equality of meta-data as well?
+  if ( this->Dimension != other.Dimension)
+    {
+    return false;
+    }
+
+  if( this->BlockLevel != other.BlockLevel )
     {
     return false;
     }

Filtering/vtkAMRBox.h

@@ -244,9 +244,18 @@ public:
   bool IsInvalid() const;
 
   // Description:
-  // Test if this box has the same dimensions as another.
+  // Test if this box is equal with the box instance on the rhs.
+  // Note: Two AMR boxes are equal if: (a) they have the same dimensionality
+  // (b) they are at the same level and (c) they occupy the same index space.
   bool operator==(const vtkAMRBox &other);
 
+  // Description:
+  // Test if this box is NOT equal with the box instance on the rhs.
+  // Note: Two AMR boxes are equal if: (a) they have the same dimensionality
+  // (b) they are at the same level and (c) they occupy the same index space.
+  bool operator!=(const vtkAMRBox &other)
+    { return(!(*this == other)); }
+
   // Description:
   // Determine if the boxes intersect but do not compute
   // the intersection