set_python_env() configuration

[tsrobinson]

Some questions/suggestions (if these are implemented, please just close/check off):

• Does/can set_python_env() overwrite the configuration file to point to the new env, such that the user does not need to first run reset_rMIDAS_env()?

  • Could we add a default argument like "temporary=FALSE" to determine whether the config is rewritten permanently for future loads?

• Can we add the alias set_rMIDAS_env() for set_python_env to be consistent with reset_ and delete_ functions

  • If so, we can then deprecate set_python_env() for v1.0