New: new data() method

- It is possible at the moment to use rows().data() to get the data for
  the table, you can use rows().data( { order: 'index' } ); to get the
  data in index order - I suspect a reasonably common use when working
  with the data set (at least, I use it that way!) and its a but clumsy
  to write that way, particularly compared to the old fnGetData method.
  So the new data() method is a short cut for `rows().data( { order:
  'index' } ).flatten()` to get the data set for the host table(s).

media/src/api/api.core.js

@@ -42,6 +42,13 @@ _api.register( 'settings()', function () {
 } );
 
 
+_api.register( 'data()', function () {
+	return this.iterator( 'table', function ( settings ) {
+		return _pluck( settings.aoData, '_aData' );
+	} ).flatten();
+} );
+
+
 _api.register( 'destroy()', function ( remove ) {
 	remove = remove || false;