Added back Sim_Simple to see if I can run them when building using Rstudio

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/nwfscassmt@250 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Changed Sim_Simple to SimSimple (and documentation) to avoid possible problem with underscores in function names

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/nwfscassmt@251 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Added details about deleting packages

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/nwfscassmt@252 edb9625f-4e0d-4859-8d74-9fd3b1da38cb