America's most traditional department store is giving up an old tradition for a new, more profit-oriented one.  Macy's is going to be open for business on Thanksgiving Day.  The "New York Post" reports that Macy's will join other big retailers in opening Thanksgiving night, afternoon or morning.  The "Post" quotes sources who say Macy's brass got tired of seeing people top off watching the big Macy's Thanksgiving Parade in New York City by doing their holiday shopping in stores that were open.  This Thanksgiving, Macy's will be one of those stores.