Merge pull request #381 in G/fastr from ~STEPAN.SINDELAR_ORACLE.COM/fastr:feature/more-specials to master

* commit '2f2d4635':
  Specials for AccessField ($) built-in
  Specials for binary arithmetic/boolean operations
  Specials for UpdateSubset and UpdateSubscript
  Specials can check and accept/decline the signature of the call

Merge pull request #382 in G/fastr from ~MICK.JORDAN_ORACLE.COM/fastr:feature/refactor-hocon to master

* commit 'ee3c17e5':
  ci.hocon: doc update

Merge pull request #379 in G/fastr from ~MICK.JORDAN_ORACLE.COM/fastr:feature/refactor-hocon to master

* commit '7b60982d':
  ci.hocon: gate -> rgate
  ci.hocon: fix nested "packages"
  ci.hocon: no forward references
  mx.originalgate -> mx.gate; add rgate
  refactor ci.hocon

* commit '854e16b1':
  update truffle revision

* commit 'd1cc6cc3':
  RRuntime.doubleToString and RRuntime.complexToString removed
  copyright fixed
  WriteTable uses the static methods in Complex/DoubleVectorPrinter
  Complex and double numbers can be converted to String via static methods in Complex/DoubleVectorPrinter

* commit '10fff98b':
  pkgtest: get location of Rscript correct for subprocess when R.home is not cwd

* commit '74331e52':
  use '$ORIGIN' for libR rpath on Linux
  mx copylib: ignore non-existent directories in PKG_LDFLAGS_OVERRIDE
  use rpath in preferece to loader_path in library shared objects

Complex and double numbers can be converted to String via static methods in Complex/DoubleVectorPrinter

Merge pull request #374 in G/fastr from ~LUKAS.STADLER_ORACLE.COM/fastr:supplier_functions to master

* commit 'bf607626':
  add TruffleBoundaries in ForeignFunctions
  remove unnecessary CapabilitiesFunctions wrapper class

* commit '6d61fd8c':
  simplification in UpdateField
  enable passing tests
  remove scalar value casts
  clean up legacy cast API
  throw better error messages for invalid LHS in replacement
  remaining builtin cast pipelines
  add missing transferToInterpreter, remove Fallback in GetNonSharedNode
  various imports and other cleanups

* commit '58fa7e0b':
  Put String.format behind TruffleBoundary

* commit '0200d8d3':
  more complete handling of rpath'ed libraries
  jniboot: capture dlerror as a jstring immediately
  make all library references via @rpath/loader_path for relocatable release (on Mac)
  various minor changes for clean gate build
  replace JNR_PCRE with JNI_PCRE

* commit 'c52b95f8':
  separate native distributions by architecture