remove unused/incomplete command
add genome-env

CHANGELOG: Moved most of `genome-test-env` to a new command,
`genome-env`, so people can use `genome-env` to setup for running
builds, etc. with the correct UR and Workflow.  They can also continue
to use `genome-test-env` to setup for running tests which basically just
turns off database commits in addition to running `genome-env`.