add array and array1

[zapashcanon]

Hi,

I added array and array1 as I was tired of writing let* x = list y in let x = Array.of_list x.

I copy-pasted the new pp_print_iter from the Stdlib and redefined pp_list with it (and added pp_array).

The code for generating the arrays is calling list and list1 and then converting them to arrays. It's probably not the more efficient way to write it but the diff is short and it's obviously correct.

[stedolan]

Looks good, thanks!

[zapashcanon]

Thanks ! :) Is there any chance that you publish a new release on opam including this and the new Syntax module ?