[freeciv-ai] Improved AI govt evaluation

["Per I. Mathisen" <per@xxxxxxxxxxx>]

This patch should improve AI's evaluation of Democracy and Communism, and
handling of Democracy. Most importantly, it moves changing taxes _after_
changing government. Also adds the possibility of rather detailed view on
exactly what you get with the various governments - change #undef ANALYSE
to #define ANALYSE to see this data.

Thanks to Pille for comments on the weights used.

  - Per

govaifix3.diff
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