disable the save all button for attachments because that isn't implemented yet...

r=sspitzer

mailnews/base/resources/content/msgHdrViewOverlay.xul

@@ -72,7 +72,7 @@ Rights Reserved.
                   <titledbutton id="attachmentButton" class="push" value="1" align="right"/>
                   <menupopup id="attachmentPopup" popupanchor="bottomright" popupalign="topright">
                     <menuseparator/>
-                    <menuitem value="Save All..." oncommand="SaveAllAttachmentsDialog()"/>
+                    <menuitem value=".Save All..." disabled="true" oncommand="SaveAllAttachmentsDialog()"/>
                   </menupopup>
                </menu>
               <spring flex="1"/>