Add warnings to files that didn't go through an antivirus run yet

[dimaguy]

It is safer for the end user, since files dont immediately go through the scan immediately as one can see on the /info/ of a file

[popey456963]

Now we have an interstitial:

It can be overridden by adding the following to a URL:

overrideVirusCheck=true

e.g.

http://localhost:3005/uy8b?overrideVirusCheck=true

If the virus checking is disabled on a host, all URLs will be permitted.