Fix autojump.
Improve git config.

- Move git config into ~/.config/git/*.
- Set basic commit template for 54/72 summary and desc.
- Update global ignores.
- Update ignores for this repo.
- Allow sourcetree to be used as a diff/merge tool.
Improve aliases.

- Improve `tree`.
- Change and add Emacs aliases.
Update and clean Emacs Live setup.

- Update to latest Emacs Live.
- Remove sammaaron-pack.
- Track `master` branch of submodules instead of specific commits.
  Updates in the future: `git submodule foreach git pull origin master`
Add constrained Python pip support.

- pip is disallowed to install global libs.
  For this purpose, use either of:
  - syspip
  - syspip-upgrade  # self-upgrades a few packages.