[Fluxus] small commits

[gabor papp]

> * (mouse-wheel) returns 1 for up, -1 for down and 0 for nothing pressed.
i'm trying to test it on a macbook, but it always returns 0.

(define (test)
    (display (mouse-wheel))(newline))

(every-frame (test))

i look into it if i have some time. there's mouse-button in the
docstring instead of mouse-wheel.

there's also a small mouse button related issue i wanted to ask, mouse-x
and mouse-y changes only when the mouse button is pressed. is it on purpose?

some other docs/help related issues:

there's (pdata-add type name) instead of (pdata-add name type) in the
help. it's a bit confusing, because if you do it like that it does not
give any errors, just don't work.

in the more recursion section of the help, theres is a small typo:
(draw-row) (not (zero? Count)) instead of (not (zero? count))

best,
gabor