initialize of typelib types not used when loaded from configuration

[vbargsten]

When loading task configuration and converting to typelib types, the types' initilize method is not used but apperently everything is set to zero.

Example:
When loading the configuration for a JointWaypointProvider where only the position fields of the joint states are set, the other fields are shown as zero via Orocos.conf.conf["waypoint_provider::JointWaypointProvider"].conf_as_typelib("default") .

In contrast, Types::base::JointState.new calls the initilize method, and the unset fields are set to NaN.