[GR-4674] Enable browser to be used as error handler.

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

...m/oracle/truffle/r/nodes/builtin/base/DebugFunctions.java

.../truffle/r/nodes/builtin/helpers/BrowserInteractNode.java

...oracle/truffle/r/nodes/builtin/helpers/DebugHandling.java

.../oracle/truffle/r/nodes/builtin/utils/R/utils_overrides.R

...e.r.runtime/src/com/oracle/truffle/r/runtime/RSource.java

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

...ruffle.r.test/src/com/oracle/truffle/r/test/TestBase.java

...le/truffle/r/test/library/utils/TestInteractiveDebug.java