GitLab

remove variable observation_space since it is not really used anywhere and adjust examples in doc to match the code

Refactoring: distance_map is initialized in constructor, so checks like hasattr(self, 'distance_map') are unnecessary

Refactoring: delete new_position from TreeObsForRailEnv and use flatland.core.grid.grid4utils.get_new_position instead

renamed action_required instead of entering and remove two if False conditions in sparse_rail_generator

#155 return in info field whether agent is malfunctioning; renamed "actionable" to "entering" which describes content better