UAVTalk: Fix crash when requesting update of unknown object

UAVTalk would check whether an unknown object was single instance
even if the object type was unknown, which caused a segfault.  This
value is only used to validate the payload length (possibly an
unnecessary check) so now that check is not applied if the object
is unknown.

The response to an OBJ_REQ for an unknown object is simply to return
a NAK packet so this should keep multiple instance objects ACK'ing
properly while solving the segfault for unknown objects.

Any non OBJ_REQ message should not even reach this far as they should
error our with a bad object type.

Fixes #80
Fixes #358
flyingf3: raised stack size of eventdispatcher from 130 to 256 words
Rationale behind 130 was that it is the setting which works for CopterControl.
Turns out that it is too tight for FlyingF3.
Added air and temperature constants.
Added unit conversions.
Added WGS84 constants.
Moved world magnetic model constants to physical constants file.
Replace sqrt( by sqrtf(.
Fix copyright
UAVTalk: Refactor some logic.  No functional changes.
Merge pull request #400 from peabody124/uavtalk_80

UAVTalk: Fix crash when requesting update of unknown object
Attitude: Remove erroneous correction

The z-gyro should not be influenced by the accels
Vtol Follower: Typo used horizontal instead of vertical PID
Merge pull request #409 from peabody124/attitude_fix

Attitude: Remove erroneous correction
Merge pull request #401 from lilvinz/eventdispatcher_stacksize

flyingf3: raised stack size of eventdispatcher from 130 to 256 words
Added copyright header and changes equation spacing.
Merge pull request #402 from kubark42/phys-constants-2

Phys constants 2
Refactor airframe configuration module to use enum values instead of
combobox strings. Also refactored UAVObject data calls.
Use only enum type for airframetype variable.
Simplified vehicle ui configuration slot.
Renamed refreshWidgetsValues(int), since it was completely different and
yet similarly named to the refreshWidgetsValues(UAVObject*) parent method.