move headers to include/mcc to match duild and deploy configurations

move mcc_bsplines.h from fitpack to include/mcc
rewrite CMakeLists.txt to incorporate these changes

tests/mcc_pzone_test.cpp

@@ -1,8 +1,8 @@
 #include <iostream>
 
-#include "mcc_coordinate.h"
-#include "mcc_pzone.h"
-#include "mcc_pzone_container.h"
+#include <mcc/mcc_coordinate.h>
+#include <mcc/mcc_pzone.h>
+#include <mcc/mcc_pzone_container.h>
 
 using namespace mcc::impl;