Merge pull request #369 in G/fastr from ~ZBYNEK.SLAJCHRT_ORACLE.COM/fastr:bypassNode2 to master

* commit '8f4a5799': (22 commits)
  Unit tests for cast pipelines builder + small fixes to have consistent semantics
  Updated the javadoc of the arg method in CastBuilder
  test output file re-generated
  trailing spaces removed
  Chimney-sweeping adapted to processing all builtins in batch
  rbdiag supports two levels of matching the outputs produced by FastR and GnuR
  rbdiag can use RMissing and RNull values as the only samples
  CastPipeline: bypassing strings + few fixes
  CastBuilder documentation
  Implemented optimizations using the new intermediate representation.
  CastBuilder refactoring: inner classes moved to separate package
  CastBuilder: removed old API and replaced with equivalent expressed in new API
  Fix compilation errors
  Cast pipelines diagnostics re-implemented using CP-IR
  passing tests after CP-IR refactoring
  A major CP refactoring using an intermediate representation (CP-IR)
  Intermediate representation of the cast pipeline
  Fix: Bool -> Boolean
  Initial structure of intermediate representation of cast pipeline and its conversion to CastNodes.
  BypassNode can bypass some atomic types
  ...