Ask for confirmation of partial Wavefront exports

Fix some signed/unsigned warnings

indra/newview/skins/default/xui/en-us/menu_pie_self.xml

@@ -107,6 +107,9 @@
     <menu_item_call enabled="true" label="Copy UUID" mouse_opaque="true" name="CopyUUID">
       <on_click function="Avatar.CopyUUID" />
     </menu_item_call>
+    <menu_item_call label="Save OBJ..." mouse_opaque="true" name="Save OBJ...">
+      <on_click function="Avatar.SaveAsOBJ" />
+    </menu_item_call>
   </pie_menu>
 	<menu_item_call enabled="true" label="Stand Up" name="Stand Up Self">
 		<on_click function="Self.SitOrStand"/>
@@ -119,7 +122,4 @@
 		<on_click function="ShowFloater" userdata="appearance" />
 		<on_enable function="Edit.EnableCustomizeAvatar" />
 	</menu_item_call>
-    <menu_item_call label="Save OBJ..." mouse_opaque="true" name="Save OBJ...">
-        <on_click function="Avatar.SaveAsOBJ" />
-    </menu_item_call>
 </pie_menu>

indra/newview/skins/default/xui/en-us/notifications.xml

@@ -9638,10 +9638,16 @@ Would you like to enable announcing keys to objects in the sim?
   </notification>
 
   <notification
-   icon="notify.tga"
+   icon="alertmodal.tga"
    name="WavefrontExportPartial"
-   type="notify">
-Unable to include [OBJECT] in export, insufficient permissions.
+   type="alertmodal">
+Unable to include [FAILED] out of [TOTAL] objects in export due to insufficient permissions.
+
+Do you wish to export anyway?
+    <usetemplate
+     name="okcancelbuttons"
+     yestext="Proceed"
+     notext="Cancel" />
   </notification>
 
   <notification