fix army removal bug
Small countries better manage their money
A bit of ai weight tweaking

changelog (from 0.7.2) :

- fix a bug where countries would greatly underestimate the cost per construction points when having under 50 construction points
- fix army spending estimation that would accumulate for a month and not reset every week, making the country downsize the armies
- Small countries will now accept a higher military spending before downsizing
- increased lroai_expected_ceiling_cost_per_construction_point to 1800
- decreased the estimated spending from investment pool
- allowed small countries to decrease their construction sectors 1 by 1. Small country used to overspend, go into debt and downsize barracks because of that, among others.
- various bugfixes for bugs that appeared when fixing above mentioned bugs
- Ai weight tweaking for technologies
- Ai weight tweaking for the building priority decision process

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