What exactly is the point of Sir Peter Maxwell Davies? I don't ask this with any malice or hostility, just in a tone of inquiry. It is a question that I think his new Violin Concerto, Fiddler on the Shore, raises. That is, is Davies still here to shock and annoy, or to assuage? The Royal Philharmonic Orchestra under Davies's baton presented the British premiere of the work last night, with Daniel Hope as the soloist, in the first of two proms that celebrated the composer's 75th birthday. Within its single-movement span were representations from the two opposing camps of Davies's life and musical language.