ai_19_8 released

added generation time bar grafix and code
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adjusted code of nodes going from planet to planet
space nodes still cause game to crash when they reach the end of their cycle....but their ltime lime to reaching this point has been drasticaly increased...to the point that this is not realy a problem.
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adjusted road linking to greater finding
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added basic town popu (click on town)
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added basic employment routine:
linked workers to farms
linked workers to mines and wells
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added icon population grafix (very basic)
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adjusted code to have icon at workplace
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note:
white icon stands for unemployed
icons are not yet usable