Create JustPremium.py

Function: If you add multiple links and one of it is from a registered premium hoster, all links from non-premium hosters will automatically be removed.

Example: A DLC with uploaded.net-, shareonline.biz- and zippyfiles.com-links is added. If you have only an uploaded.net-account, the other two hosters will be removed.

Options: unblock this hosters (comma seperated): all hosters here (pyloadformat) won't be removed. E.g. use it for your favourite freehoster. Allow all freehosters and other unknown sites: If this option is activated, only links from hosters available in the pyload "Accounts" list but without account will be removed.