DMS are now locked when used by a command. Added checks and changed

cleaning mechanisms.

src/build_reference_db.c

@@ -212,7 +212,7 @@ int build_reference_db(const char* dms_name,
 
 	// Clone the matrix view
 	// Open the DMS
-	dms = obi_open_dms(dms_name);
+	dms = obi_open_dms(dms_name, false);
 	if (dms == NULL)
 	{
 		obidebug(1, "\nError opening the DMS when building a reference database");