code refactoring

src/main/java/de/tla2b/analysis/BOperation.java

src/main/java/de/tla2b/analysis/InstanceTransformation.java

src/main/java/de/tla2b/analysis/SpecAnalyser.java

src/main/java/de/tla2b/analysis/TypeChecker.java

src/main/java/de/tla2b/output/ASTPrettyPrinter.java

src/main/java/de/tla2b/translation/BDefinitionsFinder.java

src/main/java/de/tla2b/types/TLAType.java

src/main/java/de/tla2b/types/TupleOrFunction.java

src/main/java/de/tla2bAst/BAstCreator.java

src/main/java/de/tla2bAst/ExpressionTranslator.java

...est/java/de/tla2b/expression/ModuleAndExpressionTest.java

src/test/java/de/tla2b/util/TestTypeChecker.java

src/test/java/de/tla2b/util/TestUtil.java