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

* commit 'bdef5e6d':
  Use Truffle TimeBoxing to timeout unit tests
  update Truffle version

* commit 'd17d2dbe':
  A specialization added to RemoveFixedAttributeNode
  A couple of fixes in the new attributes model
  get/setRowNames occurences replaced by node invocations
  the rownames field removed from RVector
  More getNames() occurences treated
  AbstractContainer.setNames call sites replaced by node invocations
  AbstractContainer.getNames call sites replaced by node invocations
  the names field removed from RVector
  AbstractContainer.getDimNames call sites replaced by node invocations
  RAbstractContainer.setDimNames call sites replaced by node invocations
  Get/Set/Remove nodes created for each special attribute
  several inlining issues fixed
  RAbstractContainer.getDimensions call sites replaced by node invocations
  JavaDoc added to attribute nodes
  Replacing RAttributable.getAttr call sites by node invocations
  SetClassAttributeNode introduced

Merge pull request #523 in G/fastr from ~STEPAN.SINDELAR_ORACLE.COM/fastr:feature/more-stats4 to master

* commit '82a9da26':
  Enable passing tests
  Regenerate expected test output
  Implement {x}lnorm functions and df
  Implement pbeta and all {x}cauchy
  Implement dbeta

Merge pull request #533 in G/fastr from ~LUKAS.STADLER_ORACLE.COM/fastr:feature/simple_return to master

* commit '1c36352f':
  remove use of RPromise in Return