Merge pull request #110 in G/fastr from ~STEPAN.SINDELAR_ORACLE.COM/fastr:feature/formulae to master

* commit '836521f8':
  Regenerated ExpectedTestOutput
  Fix: printing attribute values with prefix
  Fix: isFormula checks the whole 'class' vector
  Implementation of modelmatrix and modelframe
  RInternalCodeBuiltinNode - allows to implement R external in R code.

Merge pull request #114 in G/fastr from ~LUKAS.STADLER_ORACLE.COM/fastr:bugfix/boxing_comparisons to master

* commit '039ecbe3':
  more careful comparisons on boxing objects

Merge pull request #113 in G/fastr from ~LUKAS.STADLER_ORACLE.COM/fastr:feature/store_logs to master

* commit '2a4ed929':
  store logs via ci.hocon instead of outputting to the console

Merge pull request #112 in G/fastr from ~LUKAS.STADLER_ORACLE.COM/fastr:bugfix/assign_parens to master

* commit '8af36d1d':
  deparse fix (parens for assignments)

Merge pull request #108 in G/fastr from ~LUKAS.STADLER_ORACLE.COM/fastr:bugfix/various_cleanups to master

* commit 'a423a2c0':
  various cleanups (unnecessary calls, missing profiles)

When attribute value is a list, it is printed with
prefix, which is the name of the attribute. + test case

not only the first element. Formulae processed by terms.formula
get 'terms' added as a first element to their class attribute,
environment(formula) did not work properly in such case.

+ fixes of termsform + tests. These are R re-implementations
of functions from model.C file from GnuR.

Applied path from Christian Christian Humer and updated it to the
current version of the sources

Merge pull request #109 in G/fastr from ~LUKAS.STADLER_ORACLE.COM/fastr:feature/increase_test_timeout to master

* commit '1dfc00cf':
  increase timeout for tests to 20s

Merge pull request #93 in G/fastr from ~LUKAS.STADLER_ORACLE.COM/fastr:bugfix/constants_in_closures to master

* commit '4ecf74ae':
  allow serialization to insert constants to deparsed code

* commit '01554b34':
  Move SubstituteVirtualFrame into runtime project

Merge pull request #106 in G/fastr from ~LUKAS.STADLER_ORACLE.COM/fastr:bugfix/initial_visibility to master

* commit '880bcd94':
  set initial visibility to "false"

Merge pull request #101 in G/fastr from ~STEPAN.SINDELAR_ORACLE.COM/fastr:feature/small-fixes to master

* commit 'cfa8fcb3':
  Tests for parse with single identifier: parse(text='a')
  AsVector can handle RLanguage when mode='any'
  Fix eval to handle NULL as 'enclos'
  Fix RLanguage handling in `$<-` when the index does not exist
  UpdateAttr shows compatible error when lhs is NULL

Enforce guarantee that if no eager promise evaluation optimizations are used then no eager promises are created.

Merge pull request #103 in G/fastr from ~MICK.JORDAN_ORACLE.COM/fastr:feature/update-truffle to master

* commit '0364e642':
  Update truffle version

Merge pull request #94 in G/fastr from ~LUKAS.STADLER_ORACLE.COM/fastr:bugfix/symbol_comparison to master

* commit '171ca694':
  unwrap symbols into strings for boolean operations

* commit '40ccad15':
  convert int to byte for LOGICAL access

Merge pull request #97 in G/fastr from ~LUKAS.STADLER_ORACLE.COM/fastr:bugfix/various_native_symbols to master

* commit '41611c31':
  add various native symbols

Merge pull request #99 in G/fastr from ~LUKAS.STADLER_ORACLE.COM/fastr:bugfix/RNG_boundaries to master

* commit '64a5f932':
  additional TruffleBoundaries in RNG

* commit '31bd97ca':
  A fix to promise refactoring removing a problem in compiled code.
  No need to print stack trace to the file when running tests (that actually generate errors on purpose).
  Reverted to the previous test timeout value.
  Increased per-test timeout to accommodate longer execution times for package tests.
  A copyright fix.
  A checkstyle fix.
  Removed remaining post-merge comments.
  Removed eclipse warnings.
  RPromise refactoring: always use Closures, store PromiseType and OptType in one field, remove VarArgsPromise, more assertions.

No need to print stack trace to the file when running tests (that actually generate errors on purpose).