For Al Stewart fans who can't afford the five-CD set Just Yesterday, this 30-song double-disc collection is a fair – but only a fair – alternative. It is lacking a few items, however, that would make it more satisfying. For starters, the studio renditions of "Roads to Moscow" and "Nostradamus" are nowhere to be found, and then there's the absence of Stewart's debut single, "The Elf."…