Some small changes to the core

In this patch I added dynamic zoom. It reduces the number of units shown on the canvas. There was also an issue with the numbers of the points in the tooltip. They are now correct. And zooming in and out will no longer scroll the page.

The first pre-release is here!

I hope you will be interested in more. This just a small beginning for my project. Have Fun playing around with it.

Here is a small example: