A little of coordination for Rosettacode

[Jos van Uden]

On 16-2-2013 21:23, bearophile wrote:
> Jos van Uden:
>
>> Yes, that was your original suggestion, but I didn't quite understand it,
>
> When you don't understand something I say, please ask for more info :-)
>
>
>> You would reverse the left array when printing, is that correct?
>
> Right, the second half of the tape keeps the cells in reverse order.

I've split the tape in left and right. It does make the code a bit
harder to understand and debug. A linkedlist would have been more
elegant, but slower I guess.

The stress test that was posted on the talk page, I've also added.
Our UTM produces the correct result but with redundant blanks on
both sides.

0111111222222220
  ^

http://codepad.org/2SK611Wd