A fix-up of the warning conditions in BypassNode

The contains method added to TypeExpr

empty vector mappers added

The first half of the cast pipelines fixed to bypass RNull and RMissing

a fix-up in CastBuilder.getCasts() method

The second half of the cast pipelines affected by the new RNull and RMissing handling fixed.

FindFirstNode invoked directly from the BypassNode; all pipelines wrapped by the BypassNode

rebased on master

The bypassReady step removed

Formatting issues fixed in RBuiltinDiagnostics

Style issues fixed in BypassNode

* commit '115405bc':
  Handle GNU R timeouts (e.g a crash) during unit test generation

* commit '5d94d5f0':
  checkstyle fix
  refactor context creation/initialization to match TruffleLanguage createContext/initializeContext

Merge pull request #308 in G/fastr from ~ADAM.WELC_ORACLE.COM/fastr:feature/rstudio_integration to master

* commit '7cbefa14':
  Used more appropriate API call to retrive a path from source section.
  Temporary fix for on-demand source section generation.
  Minor fix to functions returning contexts.

Merge pull request #307 in G/fastr from ~ADAM.WELC_ORACLE.COM/fastr:feature/various_updates to master

* commit 'f196abf3':
  Fixes to the parse builtin.

* commit '00136165':
  add comment
  fix regression in embedded mode polyglot init

* commit '3ecc7ef3':
  Fix new invalid fallback handlers.

* commit '39bcf889':
  Log functions pipelines modified to accept complex values
  Tests output updated
  Log and La builtins refactored
  matrix filters added

Merge pull request #301 in G/fastr from ~ADAM.WELC_ORACLE.COM/fastr:feature/rstudio_integration to master

* commit '68ae6160':
  Browser context is now simulated.
  Added support for comparing SEXP-s and contexts from native side.
  Added preliminary support for keeping context objects across native calls.
  Simulating browser context.
  Missing modifications for copying back Java objects on nested upcalls.
  Copying back Java object on nested upcalls.
  Fixed a call to tracing macro.
  Changed return type of a native interface API call so that we can preserve Java objects correctly on the native side.
  ffi: maintain stack of jmpbuf ptrs; run callEnter/callExit on Rembedded dowfalls
  FFI: implement R_Preserve/ReleaseObject and add test
  Another addition to the native API.
  While deparsing GNU R structures we need to expand attributes.

* commit '1adf1a33':
  suite.py: add licenses to repositories

* commit '8af49c1e':
  Error message fixed
  Rebased on master

* commit 'b00cecff':
  fix some missing files in FASTR_NATIVE_DEV dist; add FASTR_UNIT_TESTS dist

* commit 'f96cb456':
  remove R_INSTALL_TAR override (use internal tar), copy all GNU R 'bin' files to FastR

* commit 'eb6bd267':
  Fix wrong fallback signatures.

* commit '8089c53a':
  Revert "Rewritten parameter casts for seq.int builtin."

Merge pull request #294 in G/fastr from ~ADAM.WELC_ORACLE.COM/fastr:feature/builtins_sprint to master

* commit '632e2cf1':
  Regenerated tests.
  Rewritten parameter casts for the .fastr.dqrls builtin.
  Rewritten parameter casts for the .fastr.debug builtin.
  Rewritten parameter casts for the vector builtin.
  Rewritten parameter casts for the vapply builtin.
  Rewritten parameter casts for the unlist builtin.
  Rewritten parameter casts for the tabulate builtin.
  Rewritten parameter casts for the temple builtin.
  Rewritten parameter casts for the unclass builtin.
  Rewritten parameter casts for the unique builtin.
  Minor changes to duplicated builtin.
  Added more error messages.

Merge pull request #295 in G/fastr from ~STEPAN.SINDELAR_ORACLE.COM/fastr:feature/cast_pipelines4 to master

* commit 'bf443363':
  Row and RowMeans: converted to pipelines
  RNGFunctions: converted to cast pipelines
  Rm: converted to casts pipelines + new tests
  Rank: converted to cast pipeline
  PMinMax: converted to cast pipelines
  nzchar and pmatch: converted to cast pipelines
  NZChar+Order: converted to cast pipelines.
  Parse: converted to cast pipelines

Merge pull request #296 in G/fastr from ~LUKAS.STADLER_ORACLE.COM/fastr:feature/update_jdk to master

* commit '496c3d09':
  update to new jdk version