added the idea of each line of a column corresponding to a vector, with

the added informations of the number of elements per line and the
elements' names in the column's header structure

src/obitypes.c

@@ -35,13 +35,13 @@ size_t obi_sizeof(OBIType_t type)
 }
 
 
-size_t obi_array_sizeof(OBIType_t type, size_t nbelements)
+size_t obi_array_sizeof(OBIType_t type, size_t nb_elements, size_t nb_elements_per_line)
 {
 	size_t size;
 	size_t rsize;
 	size_t psize;
 
-	size = obi_sizeof(type) * nbelements;
+	size = obi_sizeof(type) * nb_elements * nb_elements_per_line;
 
 	psize = getpagesize();
 	rsize = size % psize;