Do not create entities at module importation.
Do not create entities at module importation.

    In sot/core/__init__.py, entities used to be created in order to populate python
    classes with commands and signals for documentation purposes.

    As the documentation produced by sphinx is not yet satisfactory, it has been decided
    to document all packages from an external documentation package.

stack-of-tasks/sot-core,stack-of-tasks/sot-core,stack-of-tasks/sot-core