store watched status of episodes;
Merge branch 'master' into watchStatus
list watched episodes on the main page;
also show number of downloaded episodes;
set path when restoring episodes; show the watched status of single episodes on the web-controller;
set file as watched when mplayer ends normally;
don't reset the playback status right after the new playlistitem was started;
fix: don't cancel tooltip updates when hovering the progress bar; remove intervals when progress reaches 100%;