Merge pull request #557 in G/fastr from ~LUKAS.STADLER_ORACLE.COM/fastr:feature/force_sources to master

* commit '806c6a62':
  new FastROptions.ForceSources to generate source sections for all nodes

* commit '82a2dc76':
  lhs might be also a RCallBaseNodeWrapper

Merge pull request #555 in G/fastr from ~STEPAN.SINDELAR_ORACLE.COM/fastr:feature/more-stats6 to master

* commit '97f9da26':
  More tests for stats functions
  Fixes in nmath ported code.
  Externals for logis distribution: dlogis, qlogis, plogis

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

- R_forceint is not equivalent to Math.round,
- forceint moved to RMath
- true/false typo in TOMS708

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