Extension to KML output format, and minor bug fix

Extended KML output by breaking flight into coloured segments representing
flight state. Add extra statistical information to description bubbles
visible in Google Earth when clicking on links in My Places.

Fix Bugs:
* output kml to file provided as argument.
* move kml coordinate output code to take advantage of nsat calculation
* remove superfluous %9.2f format specifier from raw_file output.

Signed-off-by: Mike Beattie <mike@ethernal.org>