- adding a bundle using an existing manifest with an incorrect payload should
fail with an error
- adding a bundle using an existing manifest to update the payload to a new
version should succeed
- improve format of "dna rhizome list" output to one bundle per line
- new execute() option: --exit-status=N
equivalent to assertExitStatus --stderr '==' N
- new executeOk() function, shortcut for execute --exit-status=0