By Dave Sherwood HAVANA (Reuters) – Two leading Cuban artist-dissidents faced their first day of trial on Monday after being detained nearly a year ago, part of an ongoing judicial process that human rights groups have called a “farce” and a “circus”. The activists, Luis Manuel Otero Alcantara and Maykel Castillo, are prominent members of the Havana-based San Isidro Movement, an artists collective that led several protests before many of the group left Cuba, alleging repression. Otero Alcantara is accused of defaming the national flag, contempt and public disorder, and faces 7 years in jail, a…