Fix: delete unused files

htdocs/includes/ckeditor/_source/plugins/docprops/plugin.js

@@ -1,22 +0,0 @@
-/*
-Copyright (c) 2003-2011, CKSource - Frederico Knabben. All rights reserved.
-For licensing, see LICENSE.html or http://ckeditor.com/license
-*/
-
-CKEDITOR.plugins.add( 'docprops',
-{
-	init : function( editor )
-	{
-		var cmd = new CKEDITOR.dialogCommand( 'docProps' );
-		// Only applicable on full page mode.
-		cmd.modes = { wysiwyg : editor.config.fullPage };
-		editor.addCommand( 'docProps', cmd );
-		CKEDITOR.dialog.add( 'docProps', this.path + 'dialogs/docprops.js' );
-
-		editor.ui.addButton( 'DocProps',
-		{
-			label : editor.lang.docprops.label,
-			command : 'docProps'
-		});
-	}
-});