Profile/CloudAPI top-level CLI options are now applied to the current profile. Also clean up loading of the 'env' profile a bit so that special casing of that is more hidden in "config.js". Also add support for the TRITON_URL, TRITON_TLS_INSECURE and TRITON_ACCOUNT envvars. (I didn't add TRITON_KEY_ID because a coming change will do better than that.) Fixes #28, #24.