* commit 'e7796131':
  Add neverPartOfCompilation assert to getForeignAccess
  add RUnboundValue to ForeignAccess
  more efficient implementation of RForeignAccessfactory

* commit 'e16be8f0':
  DLL.unload; remove from list!
  testrffi: add library unload; fix findvar test

* commit 'b1602c04':
  Added some comments and removed warnings related to S4 implementation.

* commit 'eb095852':
  removed bogus backslash in .gitignore
  fixed some problems in NumericalFunctions.Sign: - wrong handling of logical values - wrong error msg for non-numeric arguments

- wrong handling of logical values
- wrong error msg for non-numeric arguments

Merge pull request #519 in G/fastr from ~STEPAN.SINDELAR_ORACLE.COM/fastr:feature/stats-refactoring to master

* commit 'b2f6d6d8':
  Stats package refactoring: move stuff from StatsUtil to RMath, DPQ and MathConstants

* commit 'e06f8dbc':
  replaced instanceof(...) with Predef.rawValue()
  changed parameter type to RAbstractRawVector
  generated expected output messages
  rawToBits buildin implementation

* commit '6b07d85b':
  rffi: C, Call, Grid, Lapack, PCRE, RAppl, STats, Tools, UserRNG as Truffle Node; refactor ForeignFunctions to keep C/Fortran together
  rffi upcalls don’t over-constrain return type
  testrffi: create registered native symbols for functions; test calling via string or native symbol

Merge pull request #521 in G/fastr from ~STEPAN.SINDELAR_ORACLE.COM/fastr:feature/update-truffle to master

* commit '43f09bdf':
  Update Truffle version

Merge pull request #517 in G/fastr from ~STEPAN.SINDELAR_ORACLE.COM/fastr:feature/more-stats1 to master

* commit 'f56b9a47':
  Implement more externals from stats library

* commit '1a279978':
  Minor S4 fix.

rffi: C, Call, Grid, Lapack, PCRE, RAppl, STats, Tools, UserRNG as Truffle Node; refactor ForeignFunctions to keep C/Fortran together