delayed steel techs 1 era later.

technical change : revert back the base free construction point in base value but made some techs (one era 1 and one era 2) reduce it instead.
So early game is less rough for very tiny countries while avoiding most of the issues given by free CP

reduced base free construction point from 10 to 5
Part of the solution against a major exploit

reduced back research time by 10%

last change was overdone. Hopefully this will lead to a good middleground

increased technology research time by 25%

was to quick to reach era 5 with most advanced countries. Adjustement was needed

1.7 compatch + re-added some missing admin buildings

hotfix : removed now superflous admin buildings

update to 1.6

static modifiers hotfix