Explicit cast to silence warning

splinterpolator.h

@@ -162,7 +162,7 @@ public:
     // Insert column into volume
     void Set(T *dp) const
     {
-      T   test = 1.5;
+      T   test = static_cast<T>(1.5);
       if (test == 1) {  // If T is not float or double
         for (unsigned int i=0; i<_sz; i++, dp+=_step) *dp = static_cast<T>(_col[i] + 0.5);   // Round to nearest integer
       }