rename BrowserQuitException to JumpToTopLevelException for more general use
refactor quit to separate cleanup action and implement GNU R semantics more closely

Merge pull request #124 in G/fastr from ~STEPAN.SINDELAR_ORACLE.COM/fastr:bugfix/annotate-rffi-dqrls to master

* commit 'cfb54f1b':
  Annotate dqrls method in Linpack interface for RFFI

Merge pull request #122 in G/fastr from ~STEPAN.SINDELAR_ORACLE.COM/fastr:feature/formulae2 to master

* commit 'd1c834c6':
  Implement Cdqrls external used in lm

Cdqrls is implemented as R function, which invokes .fastr.dqrls,
which is invokes Fortran routine dqrls through RFFI.

Merge pull request #121 in G/fastr from ~STEPAN.SINDELAR_ORACLE.COM/fastr:bugfix/replace-itself to master

* commit 'c89b608c':
  CachedReplaceVector: handle cases where lsh == rhs

For example pattern "vector[some.permutation.of.indices] <- vector" which is used in lm.fit

Merge pull request #120 in G/fastr from ~LUKAS.STADLER_ORACLE.COM/fastr:feature/update_truffle to master

* commit 'ee2a8ad2':
  update Truffle dependency

Merge pull request #119 in G/fastr from ~LUKAS.STADLER_ORACLE.COM/fastr:feature/update_truffle to master

* commit '0312d5e6':
  enable passing test (error message)
  update Truffle dependency

* commit 'dfca6c69':
  fix regexpr/gregexpr bug then fixed=FALSE

* commit '6481b47f':
  Fixed a problem with negation of complex numbers.