wenzelm [Mon, 05 Jan 2015 00:07:01 +0100] rev 59265
more metrics, with integer coordinates for layout;
initial coordinates: center x as in old browser;
Layout.pendulum/collapse: proper downwards range;
distance as in old browser (see spaceBetween);
move offset as in old browser;
more careful comparison wrt. 0.0 (this is IEEE double, not int);