Add RHIZOME_BUNDLE_STATUS_READONLY enum value
Tighten up switch statements on bundle and payload status enums (no
default labels)
Rename some recently added enum entries
Return bundle status and payload status in HTTP responses
Add test for failing to decrypt a foreign encrypted bundle payload,
fix bug that caused an assertion failure
Add tests for fetching a non-existent manifest and fetching bundles
whose payload blob is not in the store
/restful/meshms/SID/SID/sendmessage now enforces Content-Disposition:
form-data (was ignoring), and enforces Content-Type: text/plain;
charset=utf-8 (was ignoring)
New negative test cases to ensure that these are treated strictly
