Use the hash since it's always 40 characters long and won't hit the maximum length of system pathname.

A new shell script, `wrapper`, that (similar to what git does) in case an
excutable of the format `command-subcommand` is available (command being
the name called, $0), calling `command subcommand` will be call
`command-subcommand`. For example: calling `docker dev` will call
`docker-dev` if such an executable exists. So now `docker` (in
`~/Documents/bin/` is a symlink to `wrapper`. Changed my docker shell
aliases to scripts.

- Don't use containerized or virtualenv'ed for cli apps that are not part of a project (besides Docker isn't available on the BSDs).

non-interactive rebases.

Auto-stash rebases in autorebase git alias.

post-merge.
- Moved direnv to .bashrc, it shouldn't have been in .bash_completion.d
to begin with.
- Added a copy of pythonrc.py (from
https://github.com/lonetwin/pythonrc/).
- Generate Python startup script.
- Output during post-merge to stderr.

- Run docker prune as part of docker-clean, will work on newer versions of Docker and will remove unused networks created by docker-compose.