Merge pull request #568 in G/fastr from feature/gr-53 to master

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

...cle/truffle/r/nodes/builtin/base/ConnectionFunctions.java

...truffle/r/nodes/builtin/base/HiddenInternalFunctions.java

...untime/src/com/oracle/truffle/r/runtime/RCompression.java

.../oracle/truffle/r/runtime/conn/CompressedConnections.java

.../com/oracle/truffle/r/runtime/conn/ConnectionSupport.java

...rc/com/oracle/truffle/r/runtime/conn/FileConnections.java

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

...om/oracle/truffle/r/test/builtins/TestBuiltin_zzfile.java

mx.fastr/suite.py