[Freeciv-Dev] Eco-disasters generalization

[Tomasz Wegrzanowski <maniek@xxxxxxxx>]

Here is a patch against cvs-Jul31 that adds four new fields
to terrain.ruleset for each terrain type, and uses them instead of
hard-coded instructions for global warming and nuclear winter.

Changes ocean->land and land->ocean are not supported.
Little testing done.

gen-eco.diff.gz
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