Adding missing files

src/util/GBoxes.hpp

+/*
+ * Gboxes.hpp
+ *
+ *  Created on: May 2, 2017
+ *      Author: i-bird
+ */
+
+#ifndef OPENFPM_IO_SRC_UTIL_GBOXES_HPP_
+#define OPENFPM_IO_SRC_UTIL_GBOXES_HPP_
+
+
+/*! \brief This structure store the Box that define the domain inside the Ghost + domain box
+ *
+	\verbatim
+
+                          (Ghost + Domain)
+     +------------------+
+     |                  |
+     |  +------------+ <---------- (Domain)
+     |  |            |  |
+     |  |  Domain    |  |
+     |  |  Box       |  |
+     |  |            |  |
+     |  |            |  |
+     |  +------------+  |
+     |                  |
+     +------------------+
+(0,0) local coordinate ---> ( x, y )
+
+	\endverbatim
+
+ *
+ *  * Domain
+ *
+ * \tparam dim dimensionality
+ *
+ */
+template<unsigned int dim>
+struct GBoxes
+{
+	//! Ghost + Domain ghost
+	Box<dim,long int> GDbox;
+	//! Domain box
+	Box<dim,long int> Dbox;
+	//! origin of GDbox in global grid coordinates
+	Point<dim,long int> origin;
+};
+
+
+#endif /* OPENFPM_IO_SRC_UTIL_GBOXES_HPP_ */