Merge

...uiltin/src/com/oracle/truffle/r/nodes/builtin/base/R/is.R

...uiltin/src/com/oracle/truffle/r/nodes/builtin/base/R/rm.R

...ltin/src/com/oracle/truffle/r/nodes/builtin/base/R/sets.R

...in/src/com/oracle/truffle/r/nodes/builtin/base/R/unname.R

...iltin/src/com/oracle/truffle/r/nodes/builtin/base/Rm.java

...nodes/src/com/oracle/truffle/r/nodes/RTruffleVisitor.java

...rc/com/oracle/truffle/r/nodes/access/AccessFieldNode.java

...ime/src/com/oracle/truffle/r/runtime/data/RDataFrame.java

...untime/src/com/oracle/truffle/r/runtime/data/RVector.java

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

...le.r.test/src/com/oracle/truffle/r/test/all/AllTests.java

...om/oracle/truffle/r/test/simple/TestSimpleAttributes.java

.../com/oracle/truffle/r/test/simple/TestSimpleBuiltins.java

...c/com/oracle/truffle/r/test/simple/TestSimpleVectors.java