Trajectory service pieces

• Thoughts on a trajectory service: inputs, outputs, considerations, etc.
• Description of the .pb particle-snapshot file format
• Description of the .traj trajectory-file format
• pbtrajtools.tar.gz, a collection of perl scripts for converting/examining .pb and .traj files
• sample-pb.tar.gz (130MB), .pb-format snapshots from one set of trajectories traced in the summer 2006 Monterey Bay simulation (Aug2006_6hourly_ROMSoutput.nc)
• sample-traj.tar.gz (53MB), .traj-format compilation of the above