Merge pull request #486 in G/fastr from...

Merge pull request #486 in G/fastr from ~MICK.JORDAN_ORACLE.COM/fastr:feature/internal-pkgtest to master

* commit 'eb4e3d25':
  checkstyle fixes
  Cdist: update access
  updates from review feedback
  misc rffi bug fixes
  checkstyle fixes
  implement pretty .Internal
  implement seek on binary file connections; interporet where=NA correctly
  implement R_chk_realloc
  add Abbrev to BasePackage
  add missing string intern
  implement Abbrev .Internal
  stats: implement Cdist, DoubleCentre
  rffi: implement CADDR, move nrows/ncols logic to RRuntime, allow RIntSequence in Rf_duplicate