Enum + Std update

I added the new primitive :
    Enum.from : ('a -> unit) -> 'a t
which is similar to Stream.from.

( The only difference is that the "count" function is calling "Enum.force",
which is creating a list of the values and then modifying the enum to
enumerate on the list with a count reference )

typical usages are for I/O where you can't provide a count function at
creation time :

let input_char_enum ch =
    Enum.from (fun () -> try input_char ch with End_of_file -> raise
Enum.No_more_elements)

(added to Std , with and implementation of input_all )

Nicolas Cannasse



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