[Sur] Square root in Turtle Art

[Walter Bender]

I've created a page in the wiki describing the process I undertook to
add the sqrt function to TurtleArt:

http://sugarlabs.org/go/Patching_Turtle_Art

There is also a link to an unofficial TurtleArt-11.xo (unofficial
because the maintainer hasn't yet approved the changes I made and it
hasn't yet undergone any testing--this is where you can help):

http://wiki.laptop.org/images/9/9e/Turtleart-11.xo

Feedback appreciated.

regards.

-walter