The Macallan’s new 20-year-old single malt celebrates a new era for the distillery, which now has greater control over the Sherry-seasoned oak that defines its whisky.The Macallan selected 200 Valdespino-seasoned casks for a long-term whisky project, and its new $1,400 Time : Space release offers the first taste.Credit: Courtesy of The MacallanKey pointsThe Macallan Time : Space Sherry Cask is a 20-year-old single malt Scotch and the brand’s fir…