[GR-4777] Parse options, fix to Rscript args parsing, don't echo input in Rscript.

ci.hocon

...rc/com/oracle/truffle/r/launcher/JLineConsoleHandler.java

....launcher/src/com/oracle/truffle/r/launcher/Launcher.java

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

....launcher/src/com/oracle/truffle/r/launcher/RCommand.java

...her/src/com/oracle/truffle/r/launcher/RscriptCommand.java

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

....r.test.native/packages/tests4/tests4/tests/allocation5.R