[Stubbjax]

This change allows factions with free unit science to build those units in the factories of other factions. In 1.04, a USA Air Force player cannot build a Stealth Fighter in a USA Laser Airfield, for example.

This applies to the following factions/units:

• USA Air Force has access to Stealth Fighters by default, which it can now build in other Airfields
• China Nuke has access to Nuke Cannons by default, which it can now build in other War Factories
• GLA Stealth has access to Hijackers by default, which it can now build in other Barracks