Move sphere.cpp into sphere folder

src/sphere.cpp → src/sphere/sphere.cpp

@@ -2,8 +2,8 @@
 #include <fstream>
 #include <string>
 #include <complex>
-#include "include/Configuration.h"
-#include "include/sph_subs.h"
+#include "../include/Configuration.h"
+#include "../include/sph_subs.h"
 
 using namespace std;