Edits to section 1 suggested by Karl.

1) Remove the Hadley Split-Apply-Combine reference for now as it is
confusing and more narrowly R-only than the
multi-platform-data-analysis pipeline pattern otherwise being
discussed in the first paragraph.  We might be able to add it back
with suitable distinctions added.

2) Note that our goal is not just to safely transfer the data, but to
safely _and efficiently_ do so.

3) Rewrite the second to last paragraph a bit, and add a note
specifically at the end that this paper describes an R implementation
of protocol buffers.



git-svn-id: svn://svn.r-forge.r-project.org/svnroot/rprotobuf@772 edb9625f-4e0d-4859-8d74-9fd3b1da38cb