Patch #1513695: New turtle module, with demos.

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+
+========================================================
+                       A new turtle module for Python
+========================================================
+
+Turtle graphics is a popular way for introducing programming to
+kids. It was part of the original Logo programming language developed
+by Wally Feurzig and Seymour Papert in 1966.
+
+Imagine a robotic turtle starting at (0, 0) in the x-y plane. Give it
+the command turtle.forward(15), and it moves (on-screen!) 15 pixels in
+the direction it is facing, drawing a line as it moves. Give it the
+command turtle.left(25), and it rotates in-place 25 degrees clockwise.
+
+By combining together these and similar commands, intricate shapes and
+pictures can easily be drawn.
+
+----- turtle.py
+
+This module is an extended reimplementation of turtle.py from the
+Python standard distribution up to Python 2.5. (See: http:\\www.python.org)
+
+It tries to keep the merits of turtle.py and to be (nearly) 100%
+compatible with it. This means in the first place to enable the
+learning programmer to use all the commands, classes and methods
+interactively when using the module from within IDLE run with
+the -n switch.
+
+Roughly it has the following features added:
+
+- Better animation of the turtle movements, especially of turning the
+  turtle. So the turtles can more easily be used as a visual feedback
+  instrument by the (beginning) programmer.
+
+- Different turtle shapes, gif-images as turtle shapes, user defined
+  and user controllable turtle shapes, among them compound
+  (multicolored) shapes. Turtle shapes can be stgretched and tilted, which
+  makes turtles zu very versatile geometrical objects.
+
+- Fine control over turtle movement and screen updates via delay(),
+  and enhanced tracer() and speed() methods.
+
+- Aliases for the most commonly used commands, like fd for forward etc.,
+  following the early Logo traditions. This reduces the boring work of
+  typing long sequences of commands, which often occur in a natural way
+  when kids try to program fancy pictures on their first encounter with
+  turtle graphcis.
+
+- Turtles now have an undo()-method with configurable undo-buffer.
+
+- Some simple commands/methods for creating event driven programs
+  (mouse-, key-, timer-events). Especially useful for programming games.
+  
+- A scrollable Canvas class. The default scrollable Canvas can be
+  extended interactively as needed while playing around with the turtle(s).
+
+- A TurtleScreen class with methods controlling background color or
+  background image, window and canvas size and other properties of the
+  TurtleScreen.
+
+- There is a method, setworldcoordinates(), to install a user defined
+  coordinate-system for the TurtleScreen. 
+
+- The implementation uses a 2-vector class named Vec2D, derived from tuple.
+  This class is public, so it can be imported by the application programmer,
+  which makes certain types of computations very natural and compact.
+
+- Appearance of the TurtleScreen and the Turtles at startup/import can be
+  configured by means of a turtle.cfg configuration file.
+  The default configuration mimics the appearance of the old turtle module.
+
+- If configured appropriately the module reads in docstrings from a docstring
+  dictionary in some different language, supplied separately  and replaces
+  the english ones by those read in. There is a utility function
+  write_docstringdict() to write a dictionary with the original (english)
+  docstrings to disc, so it can serve as a template for translations.
+