BLD: Auto-symlink and backup .bashrc and .bashrc.venv.sh
BLD: set PYENV_ROOT from $HOME, set _ANACONDA_ROOT
ENH: i3 config: Add screensaver launch on start
ENH,BUG: screensaver.sh:
* add support for getopt options
* make xset conditional on $DISPLAY
* move to xlck namespace
BLD: Makefile install, clean, upgrade, pip_install_requirements
ENH: Add sarge to requirements-suggests.txt
BLD: Add requirements.txt and requirements-all.txt
BLD: Update bootstrap_dotfiles.sh: symlinks, getopt