Remove dead code

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

...rc/com/oracle/truffle/r/engine/RRuntimeASTAccessImpl.java

...gine/src/com/oracle/truffle/r/engine/shell/REmbedded.java

...uncher/src/com/oracle/truffle/r/launcher/RCmdOptions.java

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

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

...y/src/com/oracle/truffle/r/library/fastrGrid/LPoints.java

...src/com/oracle/truffle/r/library/fastrGrid/color/RGB.java

...le/truffle/r/library/fastrGrid/device/DrawingContext.java

...oracle/truffle/r/library/methods/MethodsListDispatch.java

...ibrary/src/com/oracle/truffle/r/library/methods/Slot.java

...src/com/oracle/truffle/r/library/stats/RMultinomNode.java

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

...e/truffle/r/nodes/access/WriteLocalFrameVariableNode.java

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

...oracle/truffle/r/nodes/attributes/CopyAttributesNode.java

...cle/truffle/r/nodes/attributes/GetFixedAttributeNode.java

.../truffle/r/nodes/attributes/RemoveFixedAttributeNode.java

...cle/truffle/r/nodes/attributes/SetFixedAttributeNode.java

...ruffle/r/nodes/attributes/SpecialAttributesFunctions.java