This reverts commit dd50d1d6.

* 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.

TestBase: suppress duplicate 'E'; move important method call from assert (in case assertions disabled)

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