Added demographics dataset and .Rd file.

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

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

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/nhanesaccel@10 edb9625f-4e0d-4859-8d74-9fd3b1da38cb


git-svn-id: svn://svn.r-forge.r-project.org/svnroot/nhanesaccel@11 edb9625f-4e0d-4859-8d74-9fd3b1da38cb