Merge pull request #417 in G/fastr from ~LUKAS.STADLER_ORACLE.COM/fastr:bugfix/missing_wo_specials to master

* commit '20e58371':
  make missing work both with and without special calls

Merge pull request #412 in G/fastr from ~MICK.JORDAN_ORACLE.COM/fastr:feature/release-libs to master

* commit '28d73244':
  abort build if required library not found when FASTR_RELEASE is set

* commit '2f75aa03':
  consolidate sharing functionality
  RArguments.setArgument is no longer required

Merge pull request #397 in G/fastr from ~STEPAN.SINDELAR_ORACLE.COM/fastr:feature/specials-opt to master

* commit '8cb3629b':
  Task 'testing without specials' added to mx gate & ci.hocon
  New FastR option 'UseSpecials'

Merge pull request #411 in G/fastr from ~LUKAS.STADLER_ORACLE.COM/fastr:strange_constant_replacement to master

* commit '7c5a1d4d':
  more resilient test in EvaluatedArgumentsVisitor
  handle invalid replacements more gracefully

* commit 'e639912f':
  add TruffleBoundary to Download
  RNode: replace ClassCastException with instanceof

* commit '5cf2abaf':
  update jdk reference

Merge pull request #409 in G/fastr from ~MICK.JORDAN_ORACLE.COM/fastr:bugfix/unit-tests-apps to master

* commit '0b763120':
  Add app unit tests back to gate

* commit 'a52f80cc':
  udpate Truffle dependency

Merge pull request #402 in G/fastr from ~LUKAS.STADLER_ORACLE.COM/fastr:external_builtin_casts to master

* commit '233e7ad3':
  rewrite "download" and "fft" to use builtin casts

* commit 'a14070db':
  Combine fixes
  a couple of 'combine' tests added
  expected test outputs updated
  Rebased on master

Merge pull request #59 in G/fastr from ~LUKAS.STADLER_ORACLE.COM/fastr:feature/tests_recall to master

* commit '90203e3d':
  implement Recall using RCallNode

* commit '782ab429':
  clean up loop nodes (split while and repeat, remove unnecessary functions)

Merge pull request #405 in G/fastr from ~LUKAS.STADLER_ORACLE.COM/fastr:node_based_write_profile to master

* commit '42ff6e50':
  use node-based profile in CachedReplaceVectorNode

Merge pull request #404 in G/fastr from ~LUKAS.STADLER_ORACLE.COM/fastr:remove_builtin_arguments to master

* commit '248cfa21':
  remove unnecessary "RNode[] arguments" from RBuiltinNode
  rename function in OperationFactory