Fixed: 
- DownloadInterface.openDownload, issue where referer header is overriden by Browser.setRequestProperties
- DownloadInterface.openDownload, added short wait period for redirects when redirect URL is the same as last request. 

git-svn-id: svn://svn.jdownloader.org/jdownloader/browser@27325 ebf7c1c2-ba36-0410-9fe8-c592906822b4