deprecate and remove calls to Predef.scalarXxx functions

...ltin/src/com/oracle/truffle/r/nodes/builtin/base/Cat.java

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

.../oracle/truffle/r/nodes/builtin/base/InheritsBuiltin.java

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

...oracle/truffle/r/nodes/builtin/base/OptionsFunctions.java

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

...c/com/oracle/truffle/r/nodes/builtin/CastBuilderTest.java

....test/src/com/oracle/truffle/r/nodes/casts/TestCasts.java

...s/src/com/oracle/truffle/r/nodes/builtin/CastBuilder.java