FastR Grid emulation: window resizing using Truffle Executor feature

...ngine/src/com/oracle/truffle/r/engine/shell/RCommand.java

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

...oracle/truffle/r/nodes/test/BinaryArithmeticNodeTest.java

...om/oracle/truffle/r/nodes/test/BinaryBooleanNodeTest.java

.../src/com/oracle/truffle/r/nodes/test/SpecialCallTest.java

...st/src/com/oracle/truffle/r/nodes/test/TestUtilities.java

.../oracle/truffle/r/nodes/test/UnaryArithmeticNodeTest.java

...src/com/oracle/truffle/r/runtime/context/ContextInfo.java

...me/src/com/oracle/truffle/r/runtime/context/RContext.java