[Swift-devel] basic iterate {} construct

[Ben Clifford]

I put in the iterate construct that I talked about the other week. 
Docs to follow shortly.

It wasn't clear to me the right way to implement it in Karajan. I added an 
infinitecountingwhile karajan element which behaves similarly to while but 
maintains a counter variable that increases for zero at each iteration. 
This is then used to execute the iterate {}. Not sure if there's a nicer 
way to implement the karajan part of this.

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