Comparison report: Split the single page into multiple pages

[jowerner]

Currently, the comparison report is just one long page. Similar to the load test report, we should split this page into several smaller pages. The navigation would remain the same, but would point to the new sub-pages.

[js-xc]

While I'm at it, should we also update trend report? This is split already, with the exception of overview, which is on the same page as transactions. In the one I just generated there seems to be nothing in it and the Overview section is therefore a little short, but still I think it's weird design to merge this with another page while everything else got its own.

[rschwietzke]

Please make it consistent and nice while you are on it.