THE COMPLETE PEANUTS: 1950-1952 Charles Schulz *** Fantagraphics Books, $28.95 FOUR years after the death of car- toonist Cbarles Schulz, people still can't bear to say goodbye to the Peanut.s gang.</p><p> Now, Fantagraphics Books has launched a massive, 25 volume setrepriPting every strip Schulz ever drew. • .- In "The Compiete Peanuts: 1950-1952," the first volume, we see Charlie Brown turn from a bit of a smart aleck to the sad sack we ~ll know.</p><p> Lucy pulls the . football away for the first time, Linus appears as a baby and Snoopy is mostly a normal puppy who slowly starts to think for himself. -Michael Giltz