This patch is a follow-up to D2660/rP23745 and D2686/rP23824. Currently wonders raise the population cap by +10 each by default and another +40 each after researching the “Glorious Expansion” technology. However, wonders already have many great advantages by default (win the game, territory root, resource trickle, heal garrisoned troops very quickly), therefore they don't really need the default +10; keeping two similar wonder auras also makes them less unique.
This patch merges the two population auras to one that increases the population cap after researching the technology (which is also renamed to match the aura file name).
[EDIT] Instead of flat +50, it now is relative: +20%.