[Freeciv-Dev] Tech cost patch

[Juha Litola <slave@xxxxxxxxxxxx>]

Here is a patch implementing consistent tech costs.

It moves tech cost functionality to tech_cost in common/tech.c.
It introduces new game.ruleset variable tech_cost_style.
0 is old style, each invention increase cost by game.researchcost.
1 means tech costs game.researchcost*(1+numparenttechs) where
  numparenttechs is number requirement technologies counted recursively
  Each technology is only counted once.
2 is same as 1 but it is additionally multiplied by
  (numplayers-civswithtech)/numplayers. This is what civ3 does if
  I have understood correctly.

Gtk-client is also modified to show cost of technology in
science dialog.

Comments?

-- 
// Juha Litola

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