Note at the end of section 2 that the reflection based API is slightly
slower for some operations, but that its much more convenient for
interactive data analysis.

I want to tone down the implication that protocol buffers are the
best/fastest thing out there, and I always thought the 'particularly
well-suited' was a tad vague here.



git-svn-id: svn://svn.r-forge.r-project.org/svnroot/rprotobuf@835 edb9625f-4e0d-4859-8d74-9fd3b1da38cb