Initialize the current JSPStepManager object, to prepare for processing of this step. This method is called by the SubmissionController, and its job is to determine which "page" of the step the current user is on.
Once the page has been determined, this method also determines whether the user is completing this page (i.e. there is user input data that needs to be saved to the database) or beginning this page (i.e. the user needs to be sent to the JSP for this page).
@param context a DSpace Context object
@param request the HTTP request
@param response the HTTP response
@param subInfo submission info object
@return true if step is completed (successfully), false otherwise
@throws ServletException if a general error occurs
@throws IOException if a i/o error occurs
@throws SQLException if a database error occurs
@throws AuthorizeException if some authorization error occurs