old savefile issue hotfix and population income nerf

[p]A new beta patch is available in game properties/betas/beta branch.

here's the changelist.[/p][p][/p]

[p]Old savefiles could break the game, new compatibility code added.[/p]
[p]population income nerfed to match the higher build density from the previous patch[/p][p][/p][p][/p]

[p]cheers[/p][p]Tomas

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