Merge remote-tracking branch 'fastr/master'

...ngine/src/com/oracle/truffle/r/engine/EngineRootNode.java

...fle.r.engine/src/com/oracle/truffle/r/engine/REngine.java

.../com/oracle/truffle/r/ffi/impl/llvm/TruffleLLVM_Call.java

...r/ffi/impl/llvm/upcalls/BytesToNativeCharArrayCallMR.java

...com/oracle/truffle/r/ffi/impl/nfi/TruffleNFI_Context.java

...ruffle/r/ffi/impl/nfi/TruffleNFI_DownCallNodeFactory.java

...le/truffle/r/ffi/impl/nfi/TruffleNFI_UpCallsRFFIImpl.java

...l/src/com/oracle/truffle/r/ffi/impl/nodes/AsRealNode.java

...racle/truffle/r/ffi/impl/nodes/AttributesAccessNodes.java

...l/src/com/oracle/truffle/r/ffi/impl/nodes/MatchNodes.java

...m/oracle/truffle/r/ffi/impl/nodes/MathFunctionsNodes.java

...ry/src/com/oracle/truffle/r/library/fastrGrid/Arrows.java

...com/oracle/truffle/r/library/fastrGrid/DoSetViewPort.java

...cle/truffle/r/library/fastrGrid/DoSetViewPortBuiltin.java

...com/oracle/truffle/r/library/fastrGrid/EdgeDetection.java

...rary/src/com/oracle/truffle/r/library/fastrGrid/GPar.java

...om/oracle/truffle/r/library/fastrGrid/GridColorUtils.java

...c/com/oracle/truffle/r/library/fastrGrid/GridContext.java

...com/oracle/truffle/r/library/fastrGrid/GridLinesNode.java

...src/com/oracle/truffle/r/library/fastrGrid/GridState.java