denotational semantics for part of a language
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	modified:   09_imp_environments/ImpEnv.hs
version with processing begin-end block (with only variable env)
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	modified:   09_imp_environments/ImpEnv.hs
implemented procedure env without parameters and without recursion
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	modified:   09_imp_environments/ImpEnv.hs
bug in assignment fixed
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	modified:   09_imp_environments/ImpEnv.hs
procedures with one argument
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	modified:   09_imp_environments/ImpEnv.hs
simple garbage collector (now memory behaves like a stack), test with nested blocks
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	modified:   09_imp_environments/ImpEnv.hs
recursive procedures working
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	modified:   09_imp_environments/ImpEnv.hs
improved example programs
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	modified:   09_imp_environments/ImpEnv.hs