* Fix proposal for bug 25151
* Fix proposal for bug 25151 - pip module, pyvenv validation
* Graceful fail when virtualenv_python is defined and virtualenv_command uses the venv module
* Making sure that venv is being used as a modue "-m venv"
* Updating syntax in validations
* Updating syntax in validations - fixing stupid typo "[)"
* Raising an error if virtualenv_command is pyvenv or venv and virtualenv_python is used
* trailing whitespace gone, pyvenv, venv validation and docs update
* cleaning whitespaces from blank lines