Create a default tmux session only when none defined in tmux.conf

Signed-off-by: Sorin Ionescu <sorin.ionescu@gmail.com>
Support $PYTHONUSERBASE per PEP 370

Signed-off-by: Sorin Ionescu <sorin.ionescu@gmail.com>
Merge remote-tracking branch 'upstream/master'
modules/utility/functions/diff: add additional options
modules/completion/init.zsh: exclude more users
modules/completion/external: update submodule
modules/utility/init.zsh: switch mplayer to mpv
modules/completion/external: update submodule
Revert "modules/utility/init.zsh: add startx workaraound"

This reverts commit d6dd740f82f34c78783c18f38ae6f4789a654d5f.
Fixed in /etc/X11/xinit/xserverrc

Conflicts:
	modules/utility/init.zsh