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

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).

Tests covering the at moment working output and
ignored tests that cover the attributes of the
output -- these fail.

Plus few other unusual combinations of
parameters and related tests.

Plus tests that otherwise reveal the error.

Merge pull request #98 in G/fastr from ~LUKAS.STADLER_ORACLE.COM/fastr:feature/enable_passing_tests to master

* commit '4938210e':
  enable passing tests

Merge pull request #95 in G/fastr from ~LUKAS.STADLER_ORACLE.COM/fastr:bugfix/various_builtins to master

* commit '75c2cd35':
  fixes in various builtins (AsCall, Deparse, Formals, Match, NChar, Parse, Seq)

* commit '56a57365':
  fix mx canonicalize problem
  fix suite.py regression
  move common code from parser to runtime
  Abstract R parser implementation from main body of source code

RPromise refactoring: always use Closures, store PromiseType and OptType in one field, remove VarArgsPromise, more assertions.