It would be usefull to be able not to render the graph inside a metanode.
It will enable to enable to speed up rendering during animation.
In many cases, when working on an abstract level we do not care of exact content of a
metanode. Visualization of the aggregated values is only what we need.
Maybe we can add an extra boolean property for each node to enable/disable metanode rendering.
An other way to have that functionality is to display metanodes as normal nodes when one disable
metanode rendering in the layer manager. In the current system it is really confusing, I think that this
layer should only containt the inside of the metanode and not the metanode itself. Since the metanode is
a node, rendering of the metanode (not the graph inside) should be acheived by the node layer. I thought that
it is was working like that.