Commented out test snippets that lead to graphics package use.

....truffle.r.native/gnur/tests/src/Examples/Sweave-test-1.R

...oracle.truffle.r.native/gnur/tests/src/Examples/base-Ex.R

....truffle.r.native/gnur/tests/src/Examples/example-1_def.R

...ffle.r.native/gnur/tests/src/Examples/example-1_myA-noF.R

....truffle.r.native/gnur/tests/src/Examples/example-1_myA.R

...e.truffle.r.native/gnur/tests/src/Examples/grDevices-Ex.R

...le.truffle.r.native/gnur/tests/src/Examples/graphics-Ex.R

...racle.truffle.r.native/gnur/tests/src/Examples/stats-Ex.R

...racle.truffle.r.native/gnur/tests/src/Examples/utils-Ex.R

com.oracle.truffle.r.native/gnur/tests/src/demos.R

com.oracle.truffle.r.native/gnur/tests/src/reg-S4-examples.R

com.oracle.truffle.r.native/gnur/tests/src/reg-examples1.R

com.oracle.truffle.r.native/gnur/tests/src/reg-examples2.R

com.oracle.truffle.r.native/gnur/tests/src/reg-examples3.R

com.oracle.truffle.r.native/gnur/tests/src/reg-plot-latin1.R

com.oracle.truffle.r.native/gnur/tests/src/reg-plot.R

com.oracle.truffle.r.native/gnur/tests/src/reg-tests-1a.R

com.oracle.truffle.r.native/gnur/tests/src/reg-tests-1b.R

com.oracle.truffle.r.native/gnur/tests/src/reg-tests-1c.R

com.oracle.truffle.r.native/gnur/tests/src/reg-tests-1d.R