change calculation of points in the ranking

Every match won gives only one point, instead of 3, but every map won gives one
point too. It's the same for 2-0, but not for 2-1.
fixed overflow of simply bitfield

All bitwise operators in javascript work on 32 bit integer. As there are 91
matches, we have to partition the bitfield on 3 integers. This is now done with
a Bitfield32 class.
scroll whole player div, not just the iframe from youtube

In 2 column layout when scrolled down a bit, it's no longer jumping to the top
when a video link is clicked. The video is always in the view.