Gem-generating globals

[Cainehill]

Heh. For once I agree with Mr Trollman. Saying that Stellar Focus goes up quicker than most is terribly out of whack with reality, imo.

The main global that goes up early is Mother Oak, which can be put up as early as turn 12 or 14, depending on nation and pretender - possibly 10 or 11 for Pangaea.

Research is a limitation - the first, crucial one. After that, magic path cost - most globals can't be put up without path-boosters unless a pretender was designed to cast it. And only after that is gem cost a real limitation.