fix possible Crash in BtHandler.
fix possible Crash in McReady.cpp, see one time only, probably overflow elsewhere...
Makefile : Add .PHONY cppcheck
Fix bug not showing task lines in target dialog is DrawTsk flag was unselected
Merge branch 'V50-update' of https://github.com/brunotl/LK8000 into up50
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.