REIMPLEMENTATION grammata 0.2.0.18

implemented parsers for basic values, arithmetical expressions and functional subprograms
    Grammata.Language.AST.Functional
    Grammata.Language.AST.Expression
    Grammata.Language.AST.Value

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Changes to be committed:
	modified:   grammata.cabal
	modified:   src/Grammata/Language/AST.hs
	modified:   src/Grammata/Language/AST/Expression.hs
	modified:   src/Grammata/Language/AST/Functional.hs
	modified:   src/Grammata/Language/AST/Value.hs
	deleted:    src/Grammata/Language/Parser.hs
	deleted:    src/Grammata/Language/Parser/Expression.hs
	deleted:    src/Grammata/Language/Parser/Functional.hs
	deleted:    src/Grammata/Language/Parser/Imperative.hs
	deleted:    src/Grammata/Language/Parser/Logical.hs