[ros overlays] JointTrajectoryAction is now available in control_msgs
[human builder] Use standard armature/armature pose

Instead of the 'LAAS centric' HumanPosture (which is still used with the
pocolibs middleware).

Also, the armature sensor is now automatically added. This issue has been reported
by Omar Adair Islas Ramírez on the mailing list.
[ros] {ROSReader->ROSSubscriber}

Be more consistent with ROS terminology.

Reported by Diego Escudero
[ros] Prevent registering ROS services with no explicit type

The type is expected to be set with @ros_service(type=...).
This replace previous behaviour where ROS service would default
to (the most useless) 'MorseAnyService'. Cf commit 07ac80117a162ce for details.

Reported by Diego Escudero
{ROS,Yarp,... -> ROSDatastreamManager,YarpDatastreamManager,...}

Refactoring of datastream manager name, to match the 'xxxRequestManager'
terminology. As a side effect, it prevents confusion between a
'core.datastream.Datastream' (renamed into DatastreamManager) and
a 'middleware.abstract_datastream.AbstractDatastream' which are two
unreleated objects.

Reported by Diego Escudero.
[ros] Documented where ROS serialization/deserialization actually takes place

Reported by Diego Escudero.