Added progress bars via svMisc package. Problem with only using cat() to show updates is that when you use the package outside of R Studio, all of the cat() messages just get printed at the end.

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/nhanesaccel@54 edb9625f-4e0d-4859-8d74-9fd3b1da38cb