Autofill the https:// and store previous options

[mgifford]

I should be able to just enter in www.eeas.europa.eu without the https://

We're testing web pages so the format should be at least tried before it is rejected.

I'd also like to have the settings for screenshots & subdomains remembered from the previous time the script was run. Kinda silly to have to set it every time a URL is crawled.