Allow to combine HTTP & HTTPS in several reports (e.g. Downloads)

[#1]

depending on the protocol someone is using to load the page (http vs. https), downloads will show up as http://domain/file.pdf vs. https://domain/file.pdf

Currently these are 2 different items in the report. Would be helpful to have a setting that ignores the protocol and so aggregates the 2 items.

Reports I can see this benefit:

- Downloads

- Exit Links

- Referrers

While the referrer could be cleaned by a script tweak, it doesn't work for downloads/exits without really 'hacking' the s_code.