Reformatted lmAMM functions, modified text in subperiod manual.

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/eventstudies@280 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Modified text.

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/eventstudies@281 edb9625f-4e0d-4859-8d74-9fd3b1da38cb