isTRUE builtin, getwd, setwd, Sys.getpid, Sys.getenv

....nodes/src/com/oracle/truffle/r/nodes/builtin/base/Base.r

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

...es/src/com/oracle/truffle/r/nodes/builtin/base/Getwd.java

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

...s/src/com/oracle/truffle/r/nodes/builtin/base/IsTRUE.java

...es/src/com/oracle/truffle/r/nodes/builtin/base/Setwd.java

...rc/com/oracle/truffle/r/nodes/builtin/base/SysGetpid.java

...est/src/com/oracle/truffle/r/test/ExpectedTestOutput.test

...le.r.test/src/com/oracle/truffle/r/test/all/AllTests.java

.../com/oracle/truffle/r/test/simple/TestSimpleBuiltins.java