closes #59, #35
fix fast click blocking all scripts
limit to actual run sessions
improve run unit handling, make it more logical, base it on the proper ID
simplify and unify export widgets, add JSON export
allow exporting of item tables as JSON and xlsx
apparently excel export is not yet entirely faithful of what is currently online
runs can now be exported re #22
does not yet:
- serialize surveys into JSON (should maybe be optional)
- allow for re-importing