Merge pull request #244 in G/fastr from ~LUKAS.STADLER_ORACLE.COM/fastr:feature/micks_builtins to master

* commit 'cb913b9e':
  cast pipelines: HiddenInternalFunctions
  cast pipelines for some .fastr functions
  cast pipelines for do.call and forceAndCall
  cast pipelines for conditions,connections,file,serialize,sys,etc., functions
  add cast pipelines for readBin/writeBin
  ConnectionFunctions cast pipelines

* commit '4c2280f9':
  work on strtoi

* commit 'fb463401':
  Add .fastr.context.r/.fastr.context.rscript as true virtual R sessions using Context, and add a factory for SystemFunction to choose implementation
  remove args arg from .fastr.context.create/spawn

Merge pull request #242 in G/fastr from ~MICK.JORDAN_ORACLE.COM/fastr:feature/graalvm-pkgtest to master

* commit '21d6d687':
  pkgtest: changes to run in binary graalvm distribution

Merge pull request #243 in G/fastr from ~ADAM.WELC_ORACLE.COM/fastr:feature/builtins_sprint to master

* commit '69c31989':
  Regenerated tests.
  Rewritten parameter casts for rbind and cbind builtins.
  Rewritten parameter casts for as.function.default builtin.

* commit '8cf7fe96':
  retire RPerfStats and replace with .fastr.stats.xxx builtins

Add .fastr.context.r/.fastr.context.rscript as true virtual R sessions using Context, and add a factory for SystemFunction to choose implementation

Merge pull request #240 in G/fastr from ~ADAM.WELC_ORACLE.COM/fastr:feature/various_updates to master

* commit '2a122e5e':
  Fixed checkstyle problem.
  Enhancements to grep functions.

Merge pull request #234 in G/fastr from ~ADAM.WELC_ORACLE.COM/fastr:feature/builtins_sprint to master

* commit 'd81ca916':
  Removed eclipse warnings.
  Rewritten conversion builtins to avoid copy on identity conversion.
  Pairlist copy should involve copying attributes the same as copy method for all other data structures.
  Regenerated tests.
  Rewritten as.raw builtin to use cast pipelines.
  Rewritten as.complex builtin to use cast pipelines.
  Rewritten as.logical builtin to use cast pipelines.
  Rewritten as.double builtin to use cast pipelines.
  Rewritten as.integer builtin to use cast pipelines.
  Minor changes to as.character builtin.
  Extended cast builder to handle complex and raw vector casts.

Pairlist copy should involve copying attributes the same as copy method for all other data structures.

Merge pull request #235 in G/fastr from ~LUKAS.STADLER_ORACLE.COM/fastr:feature/various_builtins to master

* commit '7f63e893':
  make sure getIdentifier returns an interned string in ReadVariadicComponentNode
  work on strtrim
  work on tolower/toupper

* commit 'b382e78c':
  .fastr.context.eval: avoid using separate thread for pc==1

* commit '54a51f10':
  disable memory tracing when profiling ends
  allow multiple Memory tracing listeners
  add memory profiling to Rprof via generic mechanism for computing object size

* commit 'cf925fcc':
  work on transpose

Merge pull request #231 in G/fastr from ~LUKAS.STADLER_ORACLE.COM/fastr:bugfix/which_functions to master

* commit '32a8a3be':
  work on WhichFunctions