Replace 35 seconds delay with 5 second delay

Missions were not completing successfully because they were waiting for
the current waypoint number to be 1 higher than was possible

Slows down estimate and allows for smaller values to be set

prevent a false fence active report on boot, and prevent the fence
from loading when it is not needed. This saves about 200 bytes of ram
on APM2 for most users

This allows a short warning to the user through the new parachute_release tone

Only tests that the lib compiles

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.