Minor fixes of issues found when working on prophet/shiny/knitr packages

...n/src/com/oracle/truffle/r/nodes/builtin/base/AsCall.java

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

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

...fle.r.runtime/src/com/oracle/truffle/r/runtime/RType.java

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

.../com/oracle/truffle/r/test/builtins/TestBuiltin_eval.java

.../truffle/r/test/builtins/TestBuiltin_extract_replace.java

documentation/dev/testing.md