more compression support for package installation

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

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

...om/oracle/truffle/r/nodes/builtin/base/LoadFunctions.java

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

...le.r.runtime/src/com/oracle/truffle/r/runtime/RError.java

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

com.oracle.truffle.r.test.cran/r/install.cran.packages.R