It takes more than just top-shelf liquor to make a fine cocktail. It takes creativity with quality ingredients, inventive bartenders to mix them and establishments that like to be on the cutting edge. Starting Monday, the second annual Midtown Cocktail Week Sacramento begins a celebration of really good cocktails and the culture behind them: the people, the places, the spirits and the innovation of the city's growing artisan cocktail movement. "The cocktail movement -- it's just a movement toward quality," said 31-year-old bartender Erick Castro, considered by some to be the "godfather" of Sacramento's cocktail scene. "It's like the rebirth of a craft. And when you get down to it, it ju