Battled with math.h and cmath. We probably should move from C standard libraries to C++ ones internally (in places which are not visible via the interface)

src/core/kernels/integration.cuh

@@ -26,7 +26,7 @@
  */
 #pragma once
 
-#include "math_utils.h"
+#include "src/core/math_utils.h"
 
 #include <assert.h>
 

src/core/math_utils.h

@@ -25,10 +25,10 @@
  *
  */
 #pragma once
-#include <cmath>
-using namespace std; // Potentially bad practice to declare namespace std here
-// #include <math.h>   // isnan, isinf // Overloads incorrect/bugged with GCC <= 6.0
-// #include <tgmath.h> // Even this does not work
+//#include <cmath>
+// using namespace std; // Potentially bad practice to declare namespace std here
+#include <math.h> // isnan, isinf // Overloads incorrect/bugged with GCC <= 6.0
+//#include <tgmath.h> // Even this does not work
 #include <stdlib.h> // rand
 
 template <class T>