This fixes config errors for unknown animation sources for both
vehicles. The turrets do not have thermal capabilities and this restores
the missing co-pilot/observer seat in the UH1Y. Also I can't seem to get
the turret on the AH6X to rotate, but if someone knows how please leave
a comment or commit the changes. there's currently no overlay for the
observer of the AH6X since it can't move I feel it's limited enough
without an overlay like the UH1Y.
Needed to add it to variables.sqf lists.
@icomrade - Any reason FireBarrel_DZ was removed? I think we still need
it, since it is an epoch buildable class, unless we merge it with
Land_Fire_barrel.
