Minor: position attribute for layer registration

Hi guys,

I was gonna try to just give Normen the heads up on this on a pm over at the forums, but er... that's out, at the moment, I don't know his email, and it's not really big enough to start a topic over.

I think that by adding the good ol' <attr name="position" intvalue="9001" /> tag into the various spots in the layer.xml files should get rid of these two warnings while building modules for the netbeans/jme3 sdk. The intvalue might affect ordering.

It's just something that I noticed and now have enough knowledge to offer a fix.

And the minor warnings are:
WARNING [org.openide.filesystems.Ordering]: Not all children in Menu/Tools/ marked with the position attribute: [NiftyGUI, OgreXML, Textures], but some are: [org-openide-actions-ToolsAction.shadow, I18N, Separator1.instance, JavaPlatformsCustomizerAction.shadow, VariablesCustomizerAction.shadow, LibrariesCustomizerAction.shadow, org-netbeans-modules-favorites-templates-TemplatesAction.shadow, org-netbeans-modules-xml-catalog-CatalogAction.shadow, PaletteManager, Separator2.instance, org-netbeans-modules-autoupdate-ui-actions-PluginManagerAction.shadow, org-netbeans-modules-options-OptionsWindowAction-separatorBefore.instance, org-netbeans-modules-options-OptionsWindowAction.shadow]
WARNING [org.openide.filesystems.Ordering]: Not all children in Menu/Window/ marked with the position attribute: [AssetPackBrowserAction.shadow, MaterialEditorAction.shadow, SceneExplorerAction.shadow, SceneViewerAction.shadow, com-jme3-gde-core-appstates-AppStateExplorerTopComponent.shadow, com-jme3-gde-core-filters-FilterExplorerTopComponent.shadow, com-jme3-gde-welcome-WelcomeScreenTopComponent.shadow], but some are: [org-netbeans-modules-project-ui-logical-tab-action.shadow, org-netbeans-modules-project-ui-physical-tab-action.shadow, org-netbeans-modules-favorites-View.shadow, org-netbeans-core-ide-ServicesTabAction.shadow, org-netbeans-modules-tasklist-ui-TaskListAction.shadow, ShowPaletteAction.shadow, org-netbeans-core-windows-actions-GlobalPropertiesAction.shadow, Output, Navigator, Debug, Versioning, Other, Web, SwitchToRecentDocumentAction.shadow, ProgressListAction.shadow, Separator3.instance, ConfigureWindow, org-netbeans-core-windows-actions-ResetWindowsAction.shadow, Separator4.instance, CloseWindowAction.shadow, CloseAllDocumentsAction.shadow, CloseAllButThisAction.shadow, DocumentsAction.shadow]