remove setAs used to coerce dbObjectId to integer, which will no longer be needed with a forthcoming RMySQL.

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/tsdbi@562 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
remove setAs used to coerce dbObjectId to integer, no longer needed.

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/tsdbi@563 edb9625f-4e0d-4859-8d74-9fd3b1da38cb