Lower aircraft altitude

In order to work around a problem where the game does not take aircrafts' altitude into account when deciding whether a unit should be rendered or not, leading to aircrafts seemingly (dis)appearing a couple of cells into the map instead of right at the lower edge of the map.

Planes will now fly at the default altitude of 1280, helicopters slightly below at 1024.

mods/ra/rules/aircraft.yaml

@@ -7,11 +7,9 @@ BADR:
 	Armor:
 		Type: Light
 	Plane:
-		CruiseAltitude: 2560
 		ROT: 5
 		Speed: 149
 		Repulsable: False
-		MaximumPitch: 56
 	RenderUnit:
 	Cargo:
 		MaxWeight: 10
@@ -46,11 +44,9 @@ BADR.Bomber:
 	Armor:
 		Type: Light
 	Plane:
-		CruiseAltitude: 2560
 		ROT: 5
 		Speed: 149
 		Repulsable: False
-		MaximumPitch: 56
 	AmmoPool:
 		Ammo: 7
 	RenderUnit:
@@ -100,13 +96,11 @@ MIG:
 	AttackPlane:
 		FacingTolerance: 20
 	Plane:
-		CruiseAltitude: 2560
 		InitialFacing: 192
 		ROT: 4
 		Speed: 223
 		RearmBuildings: afld
 		RepulsionSpeed: 40
-		MaximumPitch: 56
 	AutoTarget:
 		TargetWhenIdle: false
 		TargetWhenDamaged: false
@@ -158,13 +152,11 @@ YAK:
 	AttackPlane:
 		FacingTolerance: 20
 	Plane:
-		CruiseAltitude: 2560
 		RearmBuildings: afld
 		InitialFacing: 192
 		ROT: 4
 		Speed: 178
 		RepulsionSpeed: 40
-		MaximumPitch: 56
 	AutoTarget:
 		TargetWhenIdle: false
 		TargetWhenDamaged: false
@@ -206,6 +198,7 @@ TRAN:
 	RevealsShroud:
 		Range: 12c0
 	Helicopter:
+		CruiseAltitude: 1024
 		RearmBuildings: hpad
 		InitialFacing: 0
 		ROT: 5
@@ -254,6 +247,7 @@ HELI:
 	AttackHeli:
 		FacingTolerance: 20
 	Helicopter:
+		CruiseAltitude: 1024
 		RearmBuildings: hpad
 		LandWhenIdle: false
 		InitialFacing: 20
@@ -303,6 +297,7 @@ HIND:
 	AttackHeli:
 		FacingTolerance: 20
 	Helicopter:
+		CruiseAltitude: 1024
 		RearmBuildings: hpad
 		LandWhenIdle: false
 		InitialFacing: 20
@@ -331,7 +326,6 @@ U2:
 	Armor:
 		Type: Heavy
 	Plane:
-		CruiseAltitude: 2560
 		ROT: 7
 		Speed: 373
 		Repulsable: False