Support concrete bibs in D2K.
Add DamagedWithoutFoundation trait for building weathering.
Add BuildableTerrainLayer and LaysTerrain traits.
Add RemoveImmediately trait for things that should only exist for one tick.
Fix PBOG and Building to support concrete placement.
Don't notify when the world attacks your base.
Add buildable concrete and weathering to D2k. Fixes #2249.
Fix BuildingInfluence style nits.
Don't stomp over other building's influence.
Actors outside the world can't grant buildable area.
Update changelog.
dedicated fix: do not restart anymore with 1 client
Fix replays for network games. Fixes #4866.
Merge pull request #4904 from pchote/replay-fix

Fix replays for network games.
Merge pull request #4883 from pchote/concrete

Add buildable concrete to D2K.
Merge pull request #4903 from ihptru/dedicated-fix

dedicated fix: do not restart anymore with 1 client
Fix UpgradeRules for upgrading mods targeting release-20131223.
Merge pull request #4905 from pchote/upgrade-fixup

Fix UpgradeRules for upgrading mods targeting release-20131223.