various cleanups

...src/com/oracle/truffle/r/engine/TruffleRLanguageImpl.java

...ngine/src/com/oracle/truffle/r/engine/interop/ListMR.java

...ruffle/r/engine/interop/RAbstractVectorAccessFactory.java

...racle/truffle/r/engine/interop/RArgsValuesAndNamesMR.java

...c/com/oracle/truffle/r/engine/interop/REnvironmentMR.java

.../src/com/oracle/truffle/r/engine/interop/RLanguageMR.java

...e/src/com/oracle/truffle/r/engine/interop/RPromiseMR.java

.../src/com/oracle/truffle/r/engine/interop/RS4ObjectMR.java

...cle/truffle/r/nodes/builtin/base/ConnectionFunctions.java

...om/oracle/truffle/r/nodes/builtin/base/FileFunctions.java

...rc/com/oracle/truffle/r/nodes/builtin/base/Identical.java

...tin/src/com/oracle/truffle/r/nodes/builtin/base/Prod.java

...n/src/com/oracle/truffle/r/nodes/builtin/base/Unlist.java

...le/r/nodes/builtin/base/foreign/FortranAndCFunctions.java

...cle/truffle/r/nodes/builtin/base/infix/SpecialsUtils.java

...fle/r/nodes/builtin/base/printer/DoubleVectorPrinter.java

...om/oracle/truffle/r/nodes/builtin/fastr/FastRContext.java

...om/oracle/truffle/r/nodes/castsTests/CastBuilderTest.java

...acle/truffle/r/nodes/access/vector/ReplaceVectorNode.java

...m/oracle/truffle/r/nodes/binary/BinaryArithmeticNode.java