Added functions to plot tracks and extra test scripts
Tidied up includes
Added note about using home-brew on the Mac

to install the dependancies
Improvements to feature identification
Latest makefile
Fixed get bearing

Calculation was actually wrong previously!
Changed to spherical coordinate calculation

of geostrophic wind
Rewrite of ncdata

For netCDF 4.  Not currently used.
Tidied up some variable names
Complete rewrite of tracking algorithm

Cost function has been replaced by hierarchical rules.
Whether a point has passed a rule or not is encoded in a bit field.
Create daily means from composite files
Test script for day means

To test the sensitivity of the algorithm on the temporal resolution
New test script

to reflect changes in tracking method
Data update