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.

completions aren't working properly.
- Added direnv bash completion.

verification).
- Use unsecure SSH connection to connect to Dojo boxes.

- Set the history file location, should work across different shells.
- All exports are together in .bashrc.
- All Bash specifics are together in .bashrc.

less portable than customizing the prompt myself.
- Symlink the TravisCI Bash completion to the one generated by the
travis gem inside .bash_completion.d, remove specific source in .bashrc.
- Moved AWS CLI completion to file inside .bash_completion.d.
- Removed some unused blocks in .bashrc.

- Split flatpak operations from apt-daily alias to flatpak-daily alias (nothing is installed globally, only update user flatpaks).

- Added Pipenv Bash completion.

- Set Tmux' send-prefix key for a remote Tmux session over an SSH connection inside a local Tmux session.