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

Merge pull request #545 in G/fastr from ~STEPAN.SINDELAR_ORACLE.COM/fastr:feature/rand-refactoring to master

* commit 'b2018cab':
  RandGenerationFunctions fixed to be more partial evaluation friendly

- individual random generation functions converted to nodes (with profiles)
- DSL powered cache of the concrete type of current random number generator

Merge pull request #536 in G/fastr from ~LUKAS.STADLER_ORACLE.COM/fastr:feature/no_context_in_S4 to master

* commit 'ee0ad739':
  no context needed in internal S4 calls

* commit '1f225bdb':
  JNI_Base: remove unused (refactored) native methods

* commit '808e7414':
  generated expected output messages
  fixed perl spliting of multibytes in strsplit

* commit '5d5a6d49':
  move more README files into documentation, add fledgling section on project structure
  doc: add developer section
  doc: add deeloper section
  update README, add documentation/.project

* commit '78503016':
  rffi: embedded test, set rpath on link