Merge pull request #839 from guilhermito/rssi_handling

Collect and use RSSI value.
GCS: Update System Health gadget to show error codes
Merge pull request #900 from rdnzl/wip-systemhealth

Extended alarm descriptions for systemhealth gadget
[STABILIZATION]: 1) Enhanced coordinated flight to include a yaw damper when
flying straight.
2) Added separate field for coordinated flight control gains.
[Coordinated Flight]: Removed bound from coordinated flight. Now the
vehicle will attempt to return to its original heading even in strong
winds.
[Coordinated flight]: Changes requested in review

1) Got rid of magic numbers.
2) Nested if statement.
Adds different VirtualBar parameters to TxPID
ManualControlCommand: use named channels

The channels field of ManualControlCommand has mapped to named
channels for quite some while but the fact it just shows us as
a vector lead people to believe it was related to the order of
the underlying driver layer.  This should decrease that
ambiguity.
[QML PFD]: Fixes an issue by which the PFD was continuing to process
events even when it was no longer visible. This specifically sets the
processed states to 0 as long as the PFD is not visible, and sets them to
the corresponding UAVO when they are.

On OSX with Qt 4.8, this saved 14% processor load.
Merge pull request #903 from peabody124/cf_pitch

ComplementaryFilter: use z-axis correction from accels
Merge pull request #861 from kubark42/fix-output-assignments

Fixed bug by which output channel assignment text could be out of sync with output channel assignments.
Merge pull request #876 from kubark42/upgraded-coordinated-flight

Upgrade coordinated flight
Merge pull request #873 from kubark42/fix-sysalarmmessaging-dependency

Explicitly add SystemAlarms UAVO to SysAlarmsMessaging .pro
Merge pull request #911 from KipK/VBar_TxPID

resubmit from #909: Adds different VirtualBar parameters to TxPID
Merge pull request #916 from peabody124/manual_named

ManualControlCommand: use named channels
Android: version bump
Merge pull request #851 from kubark42/fix-geoidseparation

Fix geoidseparation
Failsafe: when tablet has error, reset failsafe controller

If the tablet mode fails for some reason and we fall back to the
failsafe controller, it should be correctly told when it is a new
execution.
Merge pull request #877 from peabody124/fs_armed

Failsafe: only enable stabilization when armed
TabletControl: do not segfault if PathDesired not initialized