Updates to the data logging and dvl node.
Merge branch 'ldtravocean_branch_v2' of https://github.com/labust/labust-ros-pkg into ldtravocean_branch_v2
Merge branch 'ldtravocean_branch_v2' of https://github.com/labust/labust-ros-pkg into ldtravocean_branch_v2
Added the GPS position of the pool for testing. Edited launch files for internal windup. Added and tested tweaks to the model and DVL driver.