Fixed error handling for no successful outcomes, added type = None handling, fixed variable names, fixed attribute assignment.

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/eventstudies@385 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Fixed handling of univariate series.

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/eventstudies@386 edb9625f-4e0d-4859-8d74-9fd3b1da38cb