Change Glide Polar Cache Speed Step to 0.5m/s
Add best speed and min climb rate for reach ESS conical tp to Polar analysis page.
Analysis : Glide Polar
  - remove polar name, already print in dialog title.
  - remove Wing load if Polar don't have wing area.
Draw Conical ESS turnpoint slope in next waypoint side view.
Rewrite "Speed to Fly" calculation.
Update autoMC and STF for Conical ESS turnpoint
  ( autoMC need to be configured to final or AvgThermal + final )
add Netto vario parameter in Sim menu
AutoZoom : use Optimized point when Task is PG Optimized Task.
add required Ground speed for reach start turnpoint in time gate overlay
fix : autozoom don't work if current & next taskpoint use same waypoint.
fix loop optimisation warning.
fix warning : ignored qualifier.
Time gates : required Ground speed for reach start turnpoint, print "---" for too slow value and "oo" for too fast value.
use Waypoint Altitude as default Base altitude for conical ESS
Add "_CRT_NON_CONFORMING_SWPRINTFS" define to Makefile fo compatibility with mingw64 4.8.2
Add internal AlphaBlend Function for device without native AlphaBlend support
Screen orientation, save OS orientation on startup and restore it on shutdown.
  this is needed for allow use landscape mode with Oudie 2 device.
Add changelog for 5.1 version.
change version to 5.1a
Replace "AAT = On/Off" and "PG Optimized = on/off" by "Task Type=Default/AAT/Race To Goal"