setting dimensions done using node

* commit '67da42bc':
  substitute match.arg

* commit 'd5893762':
  import fix
  NativeCallInfo: add toString
  .fastr.context.eval: dispose of PolyglotEngine when run in calling thread
  rffi: revert unnecessary change to Generic_Grid
  rffi: ensure all rffi nodes are called via RootCallTargets

* commit 'e3ad6316':
  RContext update for Truffle LLVM
  rffi: maintain DLLInfo state per context
  rffi renaming; implement loadPackageDLL as Node; add missing override in stats/Geom

Merge pull request #531 in G/fastr from ~LUKAS.STADLER_ORACLE.COM/fastr:feature/enable_passing_tests to master

* commit '15ab69d6':
  enable passing tests

* commit '6792f2b1':
  generated expected output messages
  fix anyNA - the recursion parameter wasn't honored when AnyNA.isNA(list) called for the first time

called for the first time

* 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