widen range of acceptable export formats

Created by: rjw57

IMPORTANT This is tested locally with development but has not been deployed. Deployment needs to happen at the same time as uisautomation/sms-ansible#14 otherwise video upload will break. Deployment of sms2jwplayer is currently manual so you'll need to actually log into the box and type "git pull" like a caveman.

Widen the range of formats we try to upload to JWP. Some media items had neither an audio or video archive export.

Modify the CSV dump script to dump all clips and define a preferred ordering for formats, video then audio and within each decreasing quality options. Explicitly log items with no media at all (there are some!) or ones where we could not determine a "best" format.

IMPORTANT: This changes the default strip-leading path option from 1 to 0 to allow for non-archive media items to be downloaded. This needs to be combined with a change to gen_jwplayer_feed.sh to strip the "sms-archive02/" from the base URL.