Changed survey from Imports to Dependencies so that svydesign and other functions are available not only through nhanesaccel functions. Also removed following lines from hanesjournal demo, as I hope they will not be necessary.

# Load survey package
library("survey")

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/nhanesaccel@83 edb9625f-4e0d-4859-8d74-9fd3b1da38cb