move default virtual environment from myvenv to venv
move default virtual environment from myvenv to venv

also make the venvinstall.sh script more usable, especially for CIs

pajlada/tyggbot,pajlada/tyggbot,pajlada/tyggbot,pajlada/pajbot,pajlada/tyggbot,pajlada/pajbot,pajlada/pajbot,pajlada/pajbot