Fast rendering Panning and Zooming SVG based callgraph

Hi Paul,

Thank you very much for providing this improved xhprof gui!

I have been making a few small changes to xhprof. I noticed that generating a gif callgraph is faster and / or less memory hungry than png. But some graphs still failed to complete. SVG graphs do complete every time, and fast too. I created a small interface around the svg so that a user can easily go back to the previous page too.

Kind regards,


Michiel

![screen shot 2013-11-27 at 13 04 29](https://f.cloud.github.com/assets/790979/1631128/286c7e4a-575c-11e3-8bd4-d4404aa92cdb.png)