-  CHANGES IN R 3.5.2:
  PACKAGE INSTALLATION:
    * New macro CXX_VISIBILITY analogous to C_VISIBILITY (which several
      packages have been misusing for C++ code) for the default C++
      compiler (but not necessarily one used for non-default C++
      dialects like C++14).
  TESTING:
    * The random number generator tests in tests/p-r-random-tests.R no
      longer fail occasionally as they now randomly sample from
      "certified" random seeds.
  BUG FIXES:
    * The "glm" method of drop1() miscalculated the score test
      (test="Rao") when the model contained an offset.
    * Linear multiple empty models such as lm(y ~ 0) now have a
      correctly dimensioned empty coefficient matrix; reported by Brett
      Presnell.
    * vcov(<empty mlm>) and hence confint() now work (via a consistency
      change in summary.lm()).
    * confint(<multiple lm()>) now works correctly; reported on R-devel
      by Steven Pav.
    * quade.test() now also works correctly when its arguments are not
      yet sorted along groups, fixing PR#15842.
    * Installation on a Unix-alike tries harder to link to the pthread
      library where required (rather than relying on OpenMP to provide
      it: configuring with --disable-openmp was failing on some Linux
      systems).
    * The data.frame method for print(x) is fast now also for large
      data frames x and got an optional argument max, thanks to
      suggestions by Juan Telleria.
    * hist() no longer integer overflows in very rare cases, fixing

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