Division and IfThenElse are translated to newly created B AST nodes

.gitignore

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

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

src/test/java/de/tla2b/expression/SimpleExpressionTest.java

...est/java/de/tla2b/prettyprintb/RecursiveFunctionTest.java

...la2b/prettyprintb/standardmodules/ModuleNaturalsTest.java

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