added sim code for net

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/ouwie@163 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
exposed OUwie.sim.network for export

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/ouwie@164 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
still debugging sim code using TestOU.R

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/ouwie@165 edb9625f-4e0d-4859-8d74-9fd3b1da38cb