Added redirect to default report

@czue @dannyroberts In our upcoming WorldVision reports, we were requested to add ability to redirection from reports default page, to a specific report. This PR is our proposition How It could be handled. But, if you think It could be managed better, we are open to hear your propositions.
This is problematic because as I understand it, it introduces an extra redirect: the link in the browser is to the 'default' url, and then that view returns a redirect, and then the browser fetches it. We've found before that this significantly increases page load times.

If it were possible to simply have the reports tab reference the other url directly depending on whether the custom module has a `DEFAULT_URL`, that would be much better.