Elizabeth Duconge says she has quadrupled her income in the past two months. She had been an art curator in Havana. Now she works at a paladar in the Vedado district here. Paladares are privately owned restaurants and some of the most visible reforms of the Cuban economy. Duconge said she makes $30 Cuban pesos a week waitressing at La Moraleja. “I didn’t have a way to support myself and my family,” she said a few hours before President Obama arrived in Cuba on Sunday. “I started to work here and