Feature request: diffing

[TeofilC]

It would be nice to have something that allows you to diff two eventlogs. I often need to compare two eventlogs and switching between two tabs is quite time consuming.

I imagine it would work by matching up metrics in the two eventlogs and getting the differences. Then the rendering code can stay the same.
I think this wouldn't work well for some profile types as the names of things might change between rebuilds of an application, and so it couldn't match things up.

I can give this a go at some point when I have some free time