[Ocaml-lib-devel] Xarray : resizeable arrays (first cut)

[Brian H. <bh...@sp...>]

A first cut at resizeable arrays.  

Some comments:

- I haven't made the reallocation strategy explicit.  And I'm not sure I 
like the shrinking strategy.

- I stole an idea from Perl, in that negative subscripts index from the
end of the array- so get x (-1) always returns the last element of x, no
matter how long x is.

- No comments.  Interface is either that for Array, or hopefully 
"obvious".

Note that there are still a lot of functions to write:

- set, insert, and append should have _list, _array, and _xarray variants
which only realloc once

- remove_range which only reallocs once

- sub hasn't been written

- Didn't write sort functions yet

- map2?