Added classes to arguments, re-formatted the example code and value sections. Some small text modifications.

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/eventstudies@178 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Added classes to arguments, changed their descriptions. Have added FIXMEs for some arguments, need better description and listing of possible options.

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/eventstudies@179 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Reformatted value section and the example.

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/eventstudies@180 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Reformatted text, added classes, and FIXMEs.

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/eventstudies@181 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Added missing brace.

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/eventstudies@182 edb9625f-4e0d-4859-8d74-9fd3b1da38cb