* commit 'dab41646':
  TypeConvert external: tests + few fixes

* commit '7c2090e1':
  WriteTable: fix raw formatting
  WriteTable: use RConnection instead of InputStream, fix double formatting + tests

* commit '47c286f0':
  Fix slow type check for external TruffleObjects.

* commit '2bfa2f3a':
  Always use /bin/sh in system as per GNU R; get visibility correct

Merge pull request #311 in G/fastr from ~STEPAN.SINDELAR_ORACLE.COM/fastr:feature/refactoring_colSums to master

* commit '4dfa3405':
  RowSums, ColSums, RowMeans, ColMeans common code refactored including cast pipeline

Merge pull request #328 in G/fastr from ~STEPAN.SINDELAR_ORACLE.COM/fastr:fix/formulae-polishing to master

* commit 'ae43e802':
  RInternalCodeBuiltinNode does not increment ref-count for arguments: note about it in the comments + fix in R code of termsform.
  RLanguage does not override isObject
  termsform resets attributes of the result

RInternalCodeBuiltinNode does not increment ref-count for arguments: note about it in the comments + fix in R code of termsform.

Additionally: the tests against GnuR externals now check the result
of the external call as opposed to checking the result of the wrapper
of the external call. This helps to find even tinier differences.

* commit 'c15ae475':
  A fix to vector update to preserve types in case when no actual modification happens.
  Fixed a problem with handling .Environment attribute.

Merge pull request #323 in G/fastr from ~MICK.JORDAN_ORACLE.COM/fastr:feature/apache-compress to master

* commit '67ecb276':
  Use xz internal for RCompression.lzmaUncompressFromFile

* commit '958935b4':
  ci.hocon: add Mac gate

Merge pull request #321 in G/fastr from ~ADAM.WELC_ORACLE.COM/fastr:feature/s4_generic_dispatch to master

* commit '4025133b':
  Corrected the name of a native method.

Merge pull request #319 in G/fastr from ~STEPAN.SINDELAR_ORACLE.COM/fastr:feature/updateformula to master

* commit 'cb814e73':
  updateform external implemented + tests

* commit '3ca5d6ef':
  Optimized sending environments through channels plus minor fixes to channels implementation.

* commit 'f3cd1289':
  "Dead" specializations detected by rbdiag
  rbdiag supports external builtins (no chimney-sweeping atm)

* commit 'f222f71e':
  Step towards replacing bzip2/xz compression with Java implementation

* commit 'c7f9ce54':
  Regenerated tests.
  Copy a shareable structure only if its attributes are modified before sending a message through the channel.
  Without a single method with test annotation source tests are not picked up for execution.
  Corrected name of internal FastR function.

Copy a shareable structure only if its attributes are modified before sending a message through the channel.