Ian McKellen, Sigourney Weaver, Ruby Wax, Stephen Poliakoff, Richard Wilson and others remember a peerless actor and friendAlan was perhaps our most distinctive and unique stage and film performer, with a voice and phrasing that teased and taunted, mocked and despaired. I first worked with him at the RSC in Peter Brook's 1978 production of Antony and Cleopatra, with Glenda Jackson. As the Major-Domo of Cleopatra's co…