Removed useless directories

src/grammars.old/Makefile.in

src/grammars.old/abstract_syntax.ml

src/grammars.old/abstract_syntax.mli

src/grammars.old/base_grammar.ml

src/grammars.old/base_grammar.mli

src/grammars.old/lexicon_grammar.ml

src/grammars.old/lexicon_grammar.mli

src/grammars.old/parser.ml

src/grammars.old/parser.mli

src/grammars.old/signature_grammar.ml

src/grammars.old/signature_grammar.mli

src/grammars.old/syntax.ml

src/grammars.old/term_grammar.ml

src/grammars.old/term_grammar.mli

src/grammars.old/test.ml

src/lambda.old/Makefile.in

src/lambda.old/environment.ml

src/lambda.old/environment.mli

src/lambda.old/lambda.ml

src/lambda.old/lexicon.ml