Merged 'RList2Env' methods.

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

...om/oracle/truffle/r/library/methods/SubstituteDirect.java

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

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

...src/com/oracle/truffle/r/nodes/builtin/base/List2Env.java

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

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

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

...untime/src/com/oracle/truffle/r/runtime/data/Closure.java

...me/src/com/oracle/truffle/r/runtime/env/REnvironment.java