Merge pull request #74 in G/fastr from...

Merge pull request #74 in G/fastr from ~STEPAN.SINDELAR_ORACLE.COM/fastr:feature/visibility-refactoring to master

* commit '9cbe227a':
  Removed now unnecessary 'recursive' flag from Identical
  Add test cases that exercise output visibility corner cases
  FastPath handles new visibility properly
  Remove VisibilityController interface
  Replace forceVisibility for RContext.setVisibility
  Removed controlVisibility calls from RBuiltins
  Fixed VisibilityController implementors that are not built-ins
  Replaced inherited RInvisibleBuiltin with annotation
  RBuiltins annotated with visibility matching GnuR