Minor fixes and changes:

Remove a minor warning message in Debug mode for 2 dialogs.
Pcbnew: update Gerber X2 file format (File Attribute) to very last X2 specification
Eeschema: Fix a minor bug in block selection (sometimes the last selected component was select instead of items in selected area)
and better drag behavior when draging an item by the drag hotkey.

common/block_commande.cpp

@@ -71,6 +71,10 @@ void BLOCK_SELECTOR::SetMessageBlock( EDA_DRAW_FRAME* frame )
         msg = _( "Block Drag" );
         break;
 
+    case BLOCK_DRAG_ITEM:     // Drag
+        msg = _( "Drag item" );
+        break;
+
     case BLOCK_COPY:     // Copy
         msg = _( "Block Copy" );
         break;