Faster (4x) response on autoMC changes, for better understanding on how the final glide is going.
	modified:   Calc/AutoMC.cpp
Allow high MC values to be displayed near to VNE limits.
Previously only MC below 9.9 (using metrics, higher for imperials) were shown, otherwise ---.
This was leading to misunderstandings, because --- is also used for "not calculated".
THIS and previous patch are also going in 4.0b
	modified:   Calc/LDRotaryBuffer.cpp
Multimap 2: fix unreadable text colors of arrival altitudes, changed to black.
Avoid writing two times the same MC value, in case it is set to 0.
	modified:   ../Draw/Multimaps/RenderAirspace.cpp