Code Mirror editor now appears, filling the window
Correction, now it fills the document, it didn't before
I'm having an effect on the number field. Goody.
Getting mouse on and off, very messy, please clean
A bit cleaner and still working
Adds placeholder for focus handler. I know, I know.
Got numManipulator to appear
Makes numManipulator disappear

- Just to begin with
Detects "wheel" event with two-finger trackpad

- and gets the "scrolling" number (delta)
Number scrolling only reacts when mouse is over number
changeNum() being called properly
Number is changing, but NaN sometimes
Adds notes on NaN error (only happens with slow scroll down)