Adding documentation and minor changes to code for bootstrap functions

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/uwgarp@129 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Adding checks for the boot* functions and adding an example of an arbitrary function to test_boot

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/uwgarp@130 edb9625f-4e0d-4859-8d74-9fd3b1da38cb