devLX16xx: Simplified if condition chain format
devLX16xx: Simplified PFLX2 commands

Using %.0f for the bugs setting has been verified to work for the
LX16xx family
DrawFlarmRadar: Removed remaining debugging instruction
Advance to 3.1m0
Multimap M1 sideview showing glideline in SIM and not flying using glider best ld.
	modified:   RenderAirspace.cpp
Fix rounding problem using feet units in Airspace setup: clip altitude, Warning vertical margin, Altitude Warning Margin.
	modified:   ../Header/LKProfiles.h
	modified:   Dialogs/dlgAirspaceWarningParams.cpp
	modified:   Dialogs/dlgConfiguration.cpp
	modified:   Globals.cpp
	modified:   LKAirspace.cpp
	modified:   LKProfileResetDefault.cpp
Thin airspace outlines if content is not filled or selected.
This is an option, to be made permanent when agreed.
	modified:   ../Header/options.h
	modified:   Draw/DrawAirSpaces.cpp
	modified:   Draw/MapWindowA.cpp
PressureFunctions: Fixed TrueAirSpeed() function

The rho factor needs to be inside the square root!

See the C-Probe manual or https://pixhawk.ethz.ch/software/imu/pressure
devCProbe: Fixed IAS calculation

The air density at sea level (15 deg C) was ignored which led to wrong IAS
values.
Recover division by zero in Sideview (LKASSERT only in BUGSTOP mode)
	modified:   Draw/Sideview.cpp
Optimize search of near airspaces.
To activate debug option, enable DEBUG_NEAR_POINTS .
This patch is reversible.
	modified:   LKAirspace.cpp
Merge branch 'cprobe' of http://github.com/Turbo87/LK8000 into tobias
Merge branch 'lx1600' of http://github.com/Turbo87/LK8000 into tobias
Merge branch 'flarm-radar' of http://github.com/Turbo87/LK8000 into tobias
(CC) Unused PolygonVisible in DrawFunctions
	modified:   Library/DrawFunctions.cpp
Move ulli switches in LKAirspace inside options.h, and rename them
	modified:   ../Header/options.h
	modified:   LKAirspace.cpp
Clip topology to bounded screen.
	modified:   ../Header/MapWindow.h
	modified:   Draw/ScreenLatLon.cpp
	modified:   Topology/Topology.cpp
Make the Topo clipping reversible with TOPO_CLIPPING option
	modified:   ../../Header/MapWindow.h
	modified:   ../../Header/options.h
	modified:   ScreenLatLon.cpp
	modified:   ../Topology/Topology.cpp
Fix debug message in topo clipping
	modified:   Topology.cpp
Remove unused