[FEATURE REQUEST] Nicer pretty-printing

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The output of the --pretty still looks quite dense, in particular:

• There should be spaces around all binary operators and after ,, :, ), ;
• The last semicolon shouldn't be omitted
• The placing of { and } is odd, e.g.:

    function caml_string_notequal(s1, s2)
     {return 1 - caml_string_equal(s1, s2)}

• Sometimes long expressions are printed vertically, for example in caml_utf8_of_utf16:

           (c
            >=
            56319
            ||
            i
            +
            1
            ==
            l
            ||
            (d = s.charCodeAt(i + 1))
            <
            56320
            ||
            d
            >
            57343)

And some more subjective points:

• Braces after single-statement if, while, etc. shouldn't be omitted
• Declare each variable with a var instead of grouping them with , (reference)