FastR Grid: code clean-up: final, spelling, supress warning for unused parameters.

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

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

.../truffle/r/library/fastrGrid/FastRGridExternalLookup.java

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

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

.../oracle/truffle/r/library/fastrGrid/GridStateGetNode.java

...acle/truffle/r/library/fastrGrid/IgnoredGridExternal.java

...rc/com/oracle/truffle/r/library/fastrGrid/LGridDirty.java

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

...racle/truffle/r/library/fastrGrid/LInitViewPortStack.java

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

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

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

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

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

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

.../oracle/truffle/r/library/fastrGrid/ViewPortLocation.java

...ffle/r/library/fastrGrid/device/BufferedJFrameDevice.java

...le/r/library/fastrGrid/device/DrawingContextDefaults.java

.../oracle/truffle/r/library/fastrGrid/device/GridColor.java