bump version number to 0.5 (preview to orocos-dev)
bump version number to 0.5 (preview to orocos-dev)

The 1.0 will probably be released by the end of the year,
once RTT 2.0 is out (and orogen is made compatible with it),
and once it gets extensively tested on our own systems.

doudou/modelkit-component,doudou/modelkit-component