Parameterize thumb frame size

See #1039.  Does not (yet) work for images
Only show sessions on volume summary if any

Fixes #1995
Tweak some asset editing and expose excerpt from html

Fixes #1996
Work around HPC's new qsub -d bug

This will break with weird characters in $PWD but hopefully that won't
happen.
Don't check permissions on transcode return

By setting superuser in LocalAuth
Enable resizing image thumbs

Only works for jpeg.  Other formats should probably be thought of along
with previews, but this is good enough for all current use cases.
Fixes #1039
Add email to SiteParty.json with appropriate permission

Fixes #2004
Remove duplicate email field

This is rather inefficient, but oh well.  See #2004
Allow as-in race ingestion (no validation)
More flexible date parsing for ingest, and optional bday flag
Allow multiple sessions per participant by date

Weakens checking but really is necessary
Merge branch 'staging'
Merge branch 'master' into flow