Also upgrade to the latest 2013q4 "GNU Tools for ARM
Embedded Processors" toolchain since the 2012q2 release
is no longer available for download.

This fixes the installation script since version q2 has been removed
from launchpad.

this lets the GCS know what wp would be run if auto mode is selected

this lets the GCS know what wp would be run if auto mode is selected

this lets the GCS know what wp would be run if auto mode is selected

this should make waypoints along a straight path not reduce speed

this gives the ground course of the next navigation leg, which can be
used to calculate the amount of steering required

this controls how much speed error you need before brakes are used

the driver uses double precision floating point, which can't work on
8bit AVR with gcc

This is the SBP driver for Piksi, Lodestar and other forthcoming Swift Navigation GPSes.
This driver currently implements three things:
- Implements a lightweight SBP protocol detection system
- Implements Piksi as a single-point-positioning GPS (same as ublox/others)
- Implements hardware logging of GPS health and baseline messages

Forthcoming iin future updates:
- Need to implement the RTK functionality

used by SERIAL_CONTROL message

will be used for on-board radio and GPS firmware update and control
over USB

Pair-Programmed-With: Paul Riseborough <p_riseborough@live.com.au>

makes the code a bit easier to read

Pair-Programmed-With: Paul Riseborough <p_riseborough@live.com.au>

When using GPS after previously rejecting it, the GPS position will
always be offset if outside the specified glitch radius. This was the
original intent of the design and makes handling of glitches smoother.

It has been tested on replay using glitchy flight data

Aliasing can causes the bias estimate to fluctuate very rapidly as it tries
to keep up, which degrades the benefit of switching between
accelerometers to avoid aliasing.

This patch give a much more stable bias estimate during aliasing, and
allows the bias to adapt at a maximum rate of 1.0 m/s2 in 50 seconds

This reduces the chance of noisy data inhibiting GPS glitch protection