Merge branch 'master' into feature/internal-pkgtest

.../src/com/oracle/truffle/r/library/grid/GridFunctions.java

com.oracle.truffle.r.native.recommended/Makefile

com.oracle.truffle.r.native/fficall/src/include/Defn.h

com.oracle.truffle.r.native/fficall/src/jni/Rinternals.c

com.oracle.truffle.r.native/fficall/src/jni/rffiutils.c

...ruffle.r.native/fficall/src/variable_defs/variable_defs.h

com.oracle.truffle.r.native/gnur/Makefile.gnur

com.oracle.truffle.r.native/gnur/patchXzMakefile

com.oracle.truffle.r.native/library/grid/Makefile

com.oracle.truffle.r.native/library/grid/src/gpar.c

com.oracle.truffle.r.native/library/grid/src/grid.c

com.oracle.truffle.r.native/library/grid/src/grid.h

com.oracle.truffle.r.native/library/grid/src/just.c

com.oracle.truffle.r.native/library/grid/src/layout.c

com.oracle.truffle.r.native/library/grid/src/matrix.c

com.oracle.truffle.r.native/library/grid/src/register.c

com.oracle.truffle.r.native/library/grid/src/state.c

com.oracle.truffle.r.native/library/grid/src/unit.c

com.oracle.truffle.r.native/library/grid/src/util.c

com.oracle.truffle.r.native/library/grid/src/viewport.c