[WIP] Update

[lldelisle]

Hi, I wanted to update the Browser to be able to have a browser which matches pygenometracks. But I do not know anything about javascript. I fixed the browser part but I did not understand what is the goal of having 2 different things (one for the browser and one for the gene) because in the browser you can put gene names... So for the moment I did not update the gene part. Also, when you change the brower_tracks.ini, if you stop the server and relaunch it with the same port, the display is not updated. Where is it stored? Is there a way to start from scratch except just changing the port?