merge

...c/com/oracle/truffle/r/nodes/access/AccessMatrixNode.java

.../com/oracle/truffle/r/nodes/access/ArrayPositionCast.java

...racle/truffle/r/nodes/builtin/base/PrettyPrinterNode.java

...le.r.runtime/src/com/oracle/truffle/r/runtime/RError.java

....r.runtime/src/com/oracle/truffle/r/runtime/RRuntime.java

...time/src/com/oracle/truffle/r/runtime/ops/na/NACheck.java

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

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

...t/src/com/oracle/truffle/r/test/failing/FailingTests.java

...rc/com/oracle/truffle/r/test/simple/TestSimpleMatrix.java