sources dialog, wip
change sources form to account for how archive ids are now stored
Merge branch 'develop' into feature/sources-dialog

Update to latest develop to get the updates for the 0.8.1 schema change
new version of transcription viewer, supporting better embedding/page choosing
decode urls in source titles
hide pan/zoom control when there's no source loaded
add height controls and id to transcription viewer
edit sources dialog
message text when no image is available
default check the whole stream when a new source is added
select all/none/invert
Merge branch 'feature/sources-dialog' into develop