Fixed existing doxygen; preparing to add more.
Retired (deleted) unused packages.
Moved their msg/srv definitions to the messages/ package instead, and revised the libscout and scoutsim files that depended on those namespaces.
Fixed CliffsensorControl, now actually part of Behaviors
Added CliffSensorControl to libscout with very basic functionalitythat hopefully doesn't break anything.(Please let me know if I did something wrong!)