It’s been more than 50 years since The Rolling Stones and a host of friends converged at Intertel TV Studio in Wembley to film The Rolling Stones Rock and Roll Circus, the concert film that featured the band alongside friends like The Who, Jethro Tull, The Dirty Mac (a supergroup featuring John Lennon, Keith Richards, Eric Clapton, and Mitch Mitchell).  The once-lost documentary has been newly restored and will be screened in select theaters throughout the United States in early April.  Originally directed by Michael Lindsay-Hogg, the film was conceived as a…