nls profiling with algorithm="port" may violate bounds (PR#8508)

Dear Professors. Bolker & Ripley:

       Thank you both very much for all your creativity and hard work 
both in your generall contributions to human knowledge and specifically 
for helping make R the great thing it is today.  I had not seen a reply 
to that email in several days, so I made time to check it out.  When I 
replicated the error, I thought it my duty to report same.  I know 
that's more appropraite with "r-help" than with "r-devel", but I thought 
such a comment might help someone.  I certainly did NOT want to add to 
someones' workload a requirement to reply to my comment.

       Thanks again,
       spencer graves

Spencer Graves <spencer.graves <at> pdf.com> writes:

Hi, Ben, et al.:

  The issue Ben identified with confint(nls(... )) generates a hard 
failure for me.  

  "We" (being Brian Ripley and I) know about this already.
  I'm sorry I failed to specify enough info in my bug report,
but I was using R-devel/2.3.0 of (I think?) 11 January, under Linux.
Your problem is actually PR #8428, which is fixed enough to prevent
a crash in 2.2.1 patched and really fixed in 2.3.0, all thanks to
Brian Ripley.

  cheers
    Ben

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