Removed ROS 'pyrobots' manifest. Useless for modern ROS versions
Added a @same_requirements_as decorator

Allow to easily copy the requirements of one action to another one.
More workswith

While here, simplified 'glance_to'
Fixed (old?) bug when closing pyrobot
Recursively look for requirements definitions

This allows to use @same_requirements_as on an action which itself
use @same_requirements_as
Modernize knowledge manipulation to match KB-API
Catch the exception in look_at when a pose is not seen anymore
[actions/attitude] Update the knowledge base according to the emotion