Crash Memorial Evokes Peace and Home
Nearly 1,000 mourners gather on fifth anniversary of crash of American Airlines Flight 587 in Rockaways section of Queens; crash took lives of all 260 aboard airliner and five people on ground and is second-deadliest aviation disaster in American history; Mayor Michael R Bloomberg dedicates memorial to victims of crash, curved and perforated wall displaying all 265 names and line from poem by by Pedro Mir, Dominican poet who died in crash; flight was en route to Dominican Republic and most of passengers were Dominican; photos; map showing crash site (M)