removed commands that will not be in wallaroo
Initial, coarse changes to shell.
Smoke-tested shell running against Wallaroo.

NB:  fairly smoky.
untested fixes for cmd_relationship
wallaby-load smoke-tested
removed some spurious logging
logging tree splits
Proxying#exists? now handles non-404 error cases
Fixes for lambda-related time travel
subsystem properly includes arcutils
Fixes miscellaneous REST interface problems