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Improved Fertility Fix

Compilation of the best ideas for improving the declining fertility issue in Attila without breaking the game in some other way. Works with existing save games.

Does three things:

--Adds a seventh fertility level (Very Rich)
--Increases fertility in all provinces at start of game by 1, as in the Fertility +1 mod. All standard fertility declines occur as scheduled, starting from the higher base level. So a rich province with no other modifiers that normally would start at 5 and end at 1, now starts at 6 (very rich) and ends at 2... if there are no other modifications.
--Barbarian and Sassanid minor town water buildings, starting at level 2, add a fertility bonus to that region of +1 per town with a water building, starting at level 2. Roman aqueduct line of city sanitation buildings also adds a regional fertility bonus, rising to a maximum of +3 at the level 4 building in the chain. Regional sanitation bonuses for all buildings above reduced to compensate. This allows every culture to engage in civic improvements to keep pace with the decaying economic infrastructure.

Historically, there is no strong evidence of drastic climate change in this period (as opposed to 100 years later, with the "Late Antique Little Ice Age," from 535 AD on, which severely depressed agriculture worldwide for two decades or more). It is better to consider what's being modelled here as a regional economy breaking down under population, immigration, and other pressures. It was more about grain laying fallow in the fields because centuries of established trade, etc., were breaking down. In reality, all these aqueducts, and wells, and qanats already existed; the sum total of the changes above is intended to reflect the real choices that were being faced... to reinvest in the economy, to keep it from falling apart, to repair the infrastructure in modern terms, or invest in war or short-term happiness of restless populations. Provinces that are paid attention to will stay about the same in fertility, but provinces that are sacked or ruined will see a rapid decline in the society-wide impacts of agriculture.

Does not affect Belisarius or Charlemagne campaigns (which use a 10-point fertility scale)