Certain units can no longer target walls

Units which cannot target walls (sandbags, chain-link fence or concrete) any longer:
Minigunner
Flamethrower
Hum-vee/Nod Buggy 
Flame Tank (can still run over sand bags and chain-link fences)
Civilian
[sniper--already so]

mods/cnc/weapons.yaml

@@ -202,6 +202,7 @@ HeliAAGun:
 Pistol:
 	ROF: 7
 	Range: 3c0
+	InvalidTargets: Wall	
 	Report: GUN18.AUD
 	Projectile: Bullet
 		Speed: 1c682
@@ -219,6 +220,7 @@ Pistol:
 M16:
 	ROF: 20
 	Range: 4c0
+	InvalidTargets: Wall	
 	Report: MGUN2.AUD
 	Projectile: Bullet
 		Speed: 1c682
@@ -358,6 +360,7 @@ OrcaAAMissiles:
 Flamethrower:
 	ROF: 55
 	Range: 2c512
+	InvalidTargets: Wall	
 	Report: FLAMER2.AUD
 	Projectile: Bullet
 		Speed: 1c682
@@ -377,6 +380,7 @@ Flamethrower:
 BigFlamer:
 	ROF: 50
 	Range: 3c512
+	InvalidTargets: Wall	
 	Report: FLAMER2.AUD
 	Projectile: Bullet
 		Speed: 341
@@ -664,6 +668,7 @@ ArtilleryShell:
 MachineGun:
 	ROF: 20
 	Burst: 4
+	InvalidTargets: Wall	
 	Range: 4c0
 	Report: MGUN11.AUD
 	Projectile: Bullet