TODO
====

- docs.
- deploy:
 - lockfile.
 - one-step ssh+sudo deployment.
 - simple deployer using just rsync.
 - check for sudo config at the remote site.
- compile:
  - per-node compiled file.
  - backups: automatic definitions for per-node backup::users.
- action lookup in multiple paths:
  - $HYDRA_FOLDER/share/{hydra,hydractl}
  - $HOME/local/share/{hydra,hydractl}
  - $APP_BASE/share/{hydra,hydractl}
  - /usr/local/share/{hydra,hydractl}
  - {hydra,hydract}-action (like git plugins)
- bootless: per-device hash/verification.