Merge branch 'feature/rstudio_integration' into feature/rstudio_integration

...fle.r.engine/src/com/oracle/truffle/r/engine/REngine.java

...rc/com/oracle/truffle/r/engine/RRuntimeASTAccessImpl.java

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

...src/com/oracle/truffle/r/nodes/builtin/base/AsVector.java

.../com/oracle/truffle/r/nodes/builtin/base/BasePackage.java

.../src/com/oracle/truffle/r/nodes/builtin/base/Complex.java

...m/oracle/truffle/r/nodes/builtin/base/DebugFunctions.java

...in/src/com/oracle/truffle/r/nodes/builtin/base/NChar.java

...n/src/com/oracle/truffle/r/nodes/builtin/base/NZChar.java

...racle/truffle/r/nodes/builtin/base/PrettyPrinterNode.java

...m/oracle/truffle/r/nodes/builtin/base/PrintFunctions.java

...tin/src/com/oracle/truffle/r/nodes/builtin/base/Quit.java

.../oracle/truffle/r/nodes/builtin/base/StandardGeneric.java

...m/oracle/truffle/r/nodes/builtin/base/TraceFunctions.java

...m/oracle/truffle/r/nodes/builtin/base/UpdateDimNames.java

.../com/oracle/truffle/r/nodes/builtin/base/UpdateNames.java

...c/com/oracle/truffle/r/nodes/builtin/base/UpdateSlot.java

...n/src/com/oracle/truffle/r/nodes/builtin/base/Vector.java

...in/src/com/oracle/truffle/r/nodes/builtin/base/Xtfrm.java

...truffle/r/nodes/builtin/base/printer/S4ObjectPrinter.java