NONE: "normal" Rust
july2016: NONE as of July 2016
legacy: Rust proof-of-concept--prior to reboot/experimental/NONE
pre-release: "development"--absolute latest code; probably broken; probably will change
prerelease-debug: pre-release with more verbose error logging (for devs or those working with devs)
debug: NONE debug?
staging: "testing"; code that was in pre-release but is now considered stable and is ready for final testing before moving to NONE
staging-debug: staging debug (see prerelease-debug)