add toupper/tolower tests, enable passing tests

...est/src/com/oracle/truffle/r/test/ExpectedTestOutput.test

.../com/oracle/truffle/r/test/builtins/TestBuiltin_attr.java

...racle/truffle/r/test/builtins/TestBuiltin_attributes.java

...oracle/truffle/r/test/builtins/TestBuiltin_structure.java

...m/oracle/truffle/r/test/builtins/TestBuiltin_tolower.java

...m/oracle/truffle/r/test/builtins/TestBuiltin_toupper.java

...cle/truffle/r/test/library/base/TestSimpleAttributes.java

...m/oracle/truffle/r/test/rpackages/TestVanillaPackage.java