starting to work on #138
starting to work on #138

zoom and pan and only works on the dimension that represents time.
drawing new links has not been entirely adjusted to this change and links look unusable (<1 px width) at certain zoom levels. This is due to the the scaling on one dimension only.

IPS-LMU/EMU-webApp,IPS-LMU/EMU-webApp,IPS-LMU/EMU-webApp,IPS-LMU/EMU-webApp,IPS-LMU/EMU-webApp,IPS-LMU/EMU-webApp