Merge pull request #623 in G/fastr from ~LUKAS.STADLER_ORACLE.COM/fastr:feature/callmatcher_fast_path to master

* commit 'f4dc078d':
  support fast paths in CallMatcherNode

* commit '2b762cd5':
  fix cumulative functions and add tests
  unify fmod functions and improve BinaryArithmetic.Mod

Merge pull request #631 in G/fastr from ~LUKAS.STADLER_ORACLE.COM/fastr:bugfix/rcallnode_empty to master

* commit 'ce332725':
  transferToInterpreter on REmpty in RCallNode

Merge pull request #626 in G/fastr from ~LUKAS.STADLER_ORACLE.COM/fastr:feature/shareobjectnode_opt to master

* commit '476aeb45':
  optimized ShareObjectNode

Merge pull request #622 in G/fastr from ~LUKAS.STADLER_ORACLE.COM/fastr:feature/doc_generic_goals to master

* commit '97ba697b':
  add generic goals to README.md

* commit 'ce2df48e':
  seq: add additional fast-path specializations

Merge pull request #628 in G/fastr from ~STEPAN.SINDELAR_ORACLE.COM/fastr:feature/small-fixes to master

* commit '3be15b7e':
  Unify double/int sequences: they can have length==0
  More robust stack trace
  Sprintf: handle '%g' with integer argument
  Simple implementation of recordGraphics internal
  Small fixes in RFFI

- Rf_duplicate accepts RDoubleSequence
- .Call builtin allows the 'list' parameter to change

* commit '742f3270':
  generated expected output messages
  type.convert of hex literals always returns double
  different warning for hex and dec integer literals
  string2DoubleNoCheck should handle non integer hex literals
  fixed typo

Merge pull request #620 in G/fastr from ~MILOSLAV.METELKA_ORACLE.COM/fastr:TruffleRLanguageInteractive to master

* commit 'f07c85cd':
  Implemented TruffleRLanguage.toString(RContext context, Object value) and isVisible() to work properly in GraalVM shell and Interop.

Merge pull request #624 in G/fastr from ~ZBYNEK.SLAJCHRT_ORACLE.COM/fastr:extBuiltinsCasts2 to master

* commit 'ebd3ae65':
  Cast pipelines added to another batch of ext builtins

Implemented TruffleRLanguage.toString(RContext context, Object value) and isVisible() to work properly in GraalVM shell and Interop.

Merge pull request #619 in G/fastr from ~LUKAS.STADLER_ORACLE.COM/fastr:feature/postprocess_args to master

* commit 'ef07d869':
  make ArgumentStatePush multithreading-safe, cleanup arg state handling

Merge pull request #618 in G/fastr from ~LUKAS.STADLER_ORACLE.COM/fastr:bugfix/enable_passing_tests to master

* commit 'ee53bd4a':
  enable passing tests, fix some error messages

Merge pull request #616 in G/fastr from ~ZBYNEK.SLAJCHRT_ORACLE.COM/fastr:extBuiltinsCasts to master

* commit '676b72bb':
  The names attribute propagated to empty vectors
  Empty vector handling fixed in the cumulative builtins
  Copyright and other minor fixes
  Cast pipelines added to external builtins. Some tests added too.

* commit '8597e4c8':
  generated expected output messages
  .colonAscending(int, double) and .colonDescending(int, double) should return RIntSequence or RDoubleSequence depending on 'right' parameter being in integer range or not.

Merge pull request #617 in G/fastr from ~LUKAS.STADLER_ORACLE.COM/fastr:bugfix/remove_arg_comments to master

* commit 'c92b30a2':
  remove unnecesarry end-of-line comments, remove unnecessary newlines

return RIntSequence or RDoubleSequence depending on 'right' parameter
being in integer range or not.