Merge pull request #520 from roderickvd/nightly

Fix filtering of hdmv_pgs_subtitle subtitles on newer ffmpeg versions
use avprobe. Fixes #503 and don't link single files for NZB. Fixes #519
missed link in getDirs. Fixes #519
override sys path with ffmpeg path. Fixes #518
don't check if option disabled.
ignore .!sync files on manual run. Fixes #519