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Added support for new ‘%~%’ relation (“is distributed as”) in plotmath.
The Fortran code underlying ‘nlminb()’ could infinite-loop if any of the functions returned ‘NA’ or ‘NaN’. This is now an error for the gradient or Hessian, and a warning for the function (with the value replaced by ‘Inf’).
‘tool::checkPoFile()’ unprotected too early in its C code and so
segfaulted from time to time.