RELEASE_3_5_12: rpy2.robjects.R.__call__() prints R warnings at the end of the evalua…

Release 3.5.12

New features

• :func:rpy2.rinterface.evalr_expr_with_visible to evaluate
  an expression and return the visibility status of the
  value returned.

• More events in the intialization and termination of an
  embedded R logged by :mod:rpy2.rinterface_lib.embedded.logger
  at INFO and DEBUG levels.

• :meth:rpy2.robjects.R.__call__ has 2 named arguments "visible" and
  "print_r_warnings" to handle R "invisible" results and print R warnings
  at the end of the evaluation. Invisible results happen when doing
  rpy2.robjects.r("x <- 1"). R will return the value of x "invisibly".
  The default are invisible is True and print_r_warnings is True.

Bugs fixed

• "R magic" cells are now show R warnings at the end of the
  evaluation of an R cell (#issue 226).

Changes

• Evaluating a string as R code using :meth:rpy2.robjects.R.__call__
  (e.g., rpy2.robjects.r("1+2")) now shows R warnings at the end
  of the evaluation by default.

• :meth:rpy2.robjects.R.__call__ returns the results invisibly by default
  (see section "New features" for this release).