GitLab

changing workdir /tmp -> /work is deferred to 0.6

fix #103

- sshd server installed in the toolbox
- ssh keys & config stored in ssh:/vol/cache and mounted as
  /.sandbox inside the sandbox
- toolbox mounted as /.toolbox inside the sandbox
- ssh agent & X11 forwarding are now working
- the toolbox commands available by default in every sandboxes
  (vim, less, nc, scp, ...)
- sandboxes now attached to a separate network (named
  'allgo_sandboxes' by default)

fix #88

(+ quote w/ shlex)

- delete old 'replaced' versions
- push 'committed' versions

to avoid race conditions on ImageManager.push()
(the function would fail if the version db row is deleted immediately)

(we never know)

(this was breaking the tests)