added bursted brownian bridges

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/move@442 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Added linear time interpolation function

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/move@443 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
functions for dealing with dBMvarianceBurst objects

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/move@444 edb9625f-4e0d-4859-8d74-9fd3b1da38cb