Cleanup on the Compositions for Devices from mars.

This cleanup also solves ambigious GroundDistanceSrv for MarsAltimeter

In the new orogen_loader setup the GroundDistanceSrv for the MarsAltimeter
could not resolved correctly. It was ambigious between because the wrong
Provider was added to the Composition.
Merge pull request #2 from goldhoorn/altimeter

Resolved ambigious GroundDistanceSrv for MarsAltimeter
document ConstantGenerator
the rock bundle is really not meant to use auto-loading

It has a very broad spectrum, so mostly nobody will have all the
task libraries it refers to installed. Turn auto-loading off so
that people can still test stuff directly in the bundle.
Added Teledyne sensor
In sonar_tritech: added missing include
Added missing require in modules/orogen/fog_kvh