Move figure1 float to [bp] from [tbp] so it is placed at the bottom of
the page.  This looks better so that section 2 with its title header
start at the top of the page, instead of the previous layout of
starting with a not-yet-referenced figure and then a section title
header beneath it.

I think this looks a bit better, but feel free to revert this change
if you disagree.



git-svn-id: svn://svn.r-forge.r-project.org/svnroot/rprotobuf@860 edb9625f-4e0d-4859-8d74-9fd3b1da38cb