Resume download restarts when there is no resume data or the download failed. Allows reloading for restored internet connection. 
Resume download restarts when there is no resume data or the download failed. Allows reloading for restored internet connection. 

git-svn-id: 765db44a9620ed55f4f8addfd3c14fe8cd57f6bb@2662 0fceea05-a30d-0410-8a8b-80ef821fb0a1

nanoant/Skim,nanoant/Skim,nanoant/Skim,nanoant/Skim,nanoant/Skim