some correction to random effect

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/hmsc@45 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
bug fix on hmscHT

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/hmsc@46 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
minor correction to scamRandom

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/hmsc@47 edb9625f-4e0d-4859-8d74-9fd3b1da38cb