(svn r13352) [0.6] -Backport from trunk (r13348, r13222, r13221, r13217):
- Fix: Industry tiles would sometimes tell they need a 'level' slope when they do not want the slope (r13348)
- Fix: Attempts to make the old AI perform better (r13217, r13221, r13222)

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Makefile*

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bin/*

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!bin/data/chars.grf

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!bin/data/openttdd.grf

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!bin/data/openttdw.grf

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!bin/data/opntitle.grf

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!bin/scenario/README

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!bin/scripts*

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config.*

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objs/*

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src/rev.cpp