Changed the marketResiduals function to return full lm object, changed it's name to marketModel. Fixed eventstudy() to convert main data to event time first and then compute estimation period and abnormal returns correctly. phys2eventtime now also returns a list of exact event times found by it.

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/eventstudies@378 edb9625f-4e0d-4859-8d74-9fd3b1da38cb