By Sachin Ravikumar LONDON (Reuters) – London’s most famous cemetery, the final resting place of revolutionary socialist Karl Marx, is searching for a new lease of life by reclaiming long-abandoned graves so they can be sold again for fresh burials. The Victorian-era Highgate Cemetery, crammed with a jumble of ivy-covered graves and ornate stone memorials, stretches across 37 acres (15 hectares) of north London and is a popular attraction, especially for left-wing visitors wanting to pay their respects at Marx’s tomb. In a practice that the father of Communism might not approve of, the graveya…