Notified fix for bicubic splines.
Notified fix for bicubic splines.

Thanks to Hank Grabowski for the patch.

JIRA: MATH-1138
apache/commons-math,sdinot/hipparchus,Hipparchus-Math/hipparchus,sdinot/hipparchus,apache/commons-math,sdinot/hipparchus,sdinot/hipparchus,apache/commons-math,Hipparchus-Math/hipparchus,Hipparchus-Math/hipparchus,apache/commons-math,Hipparchus-Math/hipparchus