Merge pull request #556 in G/fastr from ~LUKAS.STADLER_ORACLE.COM/fastr:feature/thread_safety to master

* commit '185b8b62':
  thread safety for UseMethodFunctionLookup, remove UseMethodInternalNode and NoGenericMethodException
  minor cleanups
  thread safety in RCallNode and TemporarySlotNode
  thread safety in PrepareArguments (use DSL)
  thread safety in ReadVariableNode
  thread safety in CallArgumentsNode
  thread safe and simpler PostProcessArgumentsNode and ArgumentStatePush
  thread safety in CallMatcherNode
  thread safety in PromiseNode
  thread safety in Lapply, BinaryBooleanScalarNode and FunctionDefintionNode

Merge pull request #560 in G/fastr from ~LUKAS.STADLER_ORACLE.COM/fastr:feature/paren_special to master

* commit '484517a4':
  turn parens into builtin + special

thread safety for UseMethodFunctionLookup, remove UseMethodInternalNode and NoGenericMethodException

Merge pull request #528 in G/fastr from ~LUKAS.STADLER_ORACLE.COM/fastr:feature/matrix_specials to master

* commit 'aab32f76':
  adapt and extends tests for special calls
  special calls for matrix operations, thread safety and new DSL layout in field/subset/subscript functions
  fix some visibility flags in builtins
  minor refactoring in RCallSpecialNode
  RTypesFlatLayout with flat layout and implicit casts

Merge pull request #552 in G/fastr from ~STEPAN.SINDELAR_ORACLE.COM/fastr:feature/test-traits to master

* commit 'c9bc2ffb':
  Tests traits: documentation, small refactoring and fix

special calls for matrix operations, thread safety and new DSL layout in field/subset/subscript functions

Merge pull request #547 in G/fastr from ~LUKAS.STADLER_ORACLE.COM/fastr:feature/substitute_do_call to master

* commit '0a19145b':
  turn DoCall into SUBSTITUTE to allow for efficient handling of “quote”

* commit 'bb62d4d7':
  simplifications in RContext, use new DSL layout in Tilde, fast path in RSerialize, more precise TruffleBoundary in RRuntime

* commit 'a57c10f2':
  add canStore and canSet checks to SetFixedAttributeNode
  A small fix in SetAttributeNode

* commit 'fcd825b9':
  placed the org.tukaani.xz.check.CRC64 call behind a TruffleBoundary
  trailing whitespaces
  fixed lic header
  generated expected output messages
  implemented crc64 builtin
  added XZ-1.5 library

Merge pull request #548 in G/fastr from ~LUKAS.STADLER_ORACLE.COM/fastr:feature/string_interning to master

* commit '5c2d0033':
  factor out String interning in Attr/UpdateAttr and make it thread safe

simplifications in RContext, use new DSL layout in Tilde, fast path in RSerialize, more precise TruffleBoundary in RRuntime

Merge pull request #546 in G/fastr from ~LUKAS.STADLER_ORACLE.COM/fastr:enable_passing_tests to master

* commit '1b0fb9bd':
  fix warnings and enable passing tests

* commit '93d25a35':
  EmptyTypeSystemFlatLayout annotation added to the attribute nodes.
  UpdateShareableChildValueNode moved to com.oracle.truffle.r.nodes.function.opt
  Package documentation for the new attributes model
  Iterative attribute nodes never return null
  A better profiling in the ref counting nodes
  A fix-up of refence counting when setting an attribute