Changelog for package plot_tools

Forthcoming

• hydro catkinization changes
• added python setup files and wet'ed plot tools
• Legend now is the filename
• changed odom plot to open as many files as required
• changed the private name topics to input and output.
• NEW: plot_tools pkg with a python script for 3D real-time odometry visualization
• Contributors: Miquel Massot, plnegre