[glob2-devel] fix those markets (publicly talking to myself)

[Leo Wandersleb]

hey Leo

you wanted to fix those markets! get it done!

todo:

markets collect the checked ressources and get added to the gradient of all 
other ressources.

in the alliance screen, one can choose to share ressources at the markets so 
allied units may fetch from them/allied markets may distribute ones res, too.

markets get ressource symbols for each kind of ressource they export.

markets can fill up to sum(level of all markets) * some basic for each res.

during upgrade markets can still hold the ressources and count as source of all 
ressources but are expensive to upgrade./during upgrade the markets are closed 
and thus can not hold their res./during upgrade they keep their capacity to hold 
res but are not able to deliver them.

extra:

destroying a market leaves a package with 50% of the res. that have been inside. 
a warrior may carry that to an own market. the other 50% are straight lost.

Greetings, Leo Wandersleb