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>
Add my own initial customizations.
Add some minor customizations for our work environment.
Updated and improved aliases.
Various updates and tweaks.
Update directory aliases to new project environment.
Update zshrc to current environmental changes.
Update environment, aliases, ... to newly installed Arch-system; move most environment settings to zshenv.
Add my own initial customizations.
Add pure-prompt and update personal environment and zsh-configuration.
Updated aliases.
Tame diff configuration and various other improvements and tweaks.
Env-variable updates and new functionality in zshrc.
Bring submodules to newest versions.
Cleanup and update zsh-config.
Path, dir-path and alias updates, often NodeJS related.