Use AppendMultipleContents after chopping file
Handle ToAppData::AppendMultipleContents; bugfixes
Extend chopper logic, add shelf logic, bugfixes
Define and add extract_chop_data and ChopData to prelude
Update handle_bcast, terminate BCast to flush Pages for storage
Add BCast handler that collects ChopData
Pull in chopping logic, send Data through BCasts, report back to App
Push out chopping logic, let dapp-lib handle it