MP Bug: permanent alliances & resources

[gelbs]

I'm now quite confident this can be reproduced, so I will report this as a bug.

Bug: Permanent alliances do not share strategic & luxury resources.

Steps to reproduce

1. Start a hot-seat or LAN multiplayer game
2. Set up at least one human team
3. Play the game until the allies are connected and can access at least some unique resource
4. Check the strategic resources, they are not shared

Expected behaviour: The civilopedia states that permanent alliance works as a single empire with two rulers and it explicitly mentions the sharing of resources. Even the effects of wonders are shared, but not strategic, luxury or food resources.