update truffle version; suppress deprecation warning/error on use of Source class methods

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

...ngine/src/com/oracle/truffle/r/engine/shell/RCommand.java

.../com/oracle/truffle/r/nodes/builtin/RBuiltinPackages.java

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

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

...om/oracle/truffle/r/nodes/builtin/fastr/FastRContext.java

...om/oracle/truffle/r/nodes/builtin/fastr/FastRInterop.java

.../truffle/r/nodes/builtin/helpers/BrowserInteractNode.java

...es.test/src/com/oracle/truffle/r/nodes/test/TestBase.java

...des/src/com/oracle/truffle/r/nodes/control/WhileNode.java

...cle/truffle/r/nodes/instrumentation/RInstrumentation.java

.../com/oracle/truffle/r/runtime/ffi/jnr/CallRFFIHelper.java

....r.runtime/src/com/oracle/truffle/r/runtime/RDeparse.java

...ntime/src/com/oracle/truffle/r/runtime/RInternalCode.java

....r.runtime/src/com/oracle/truffle/r/runtime/RProfile.java

....runtime/src/com/oracle/truffle/r/runtime/RSerialize.java

...fle.r.runtime/src/com/oracle/truffle/r/runtime/Utils.java

...me/src/com/oracle/truffle/r/runtime/context/RContext.java

.../src/com/oracle/truffle/r/test/generate/FastRSession.java

...est/src/com/oracle/truffle/r/test/tck/FastRDebugTest.java