Unable to trade Brennan Boesch this spring, the Detroit Tigers gave him his unconditional release this morning. “I think, sometimes, we throw that term ‘change of scenery’ around too loose, but I think this is a case where it’s probably a great thing. I truly believe that,” manager Jim Leyland said today. “I still think there’s potential there. It wasn’t going to fit with our club this particular year. Hopefully, Brennan will move forward, and things will work out for him like we hoped they would have here. Just didn’t work, and I’ll leave it at that.” By releasing Boesch now, the Tigers owe him one-sixth of the $2.3-million salary they tendered him in January -- about $400,000. Tigers president/general manager Dave Dombrowski told reporters this morning, before the Tigers played Florida Southern College at Joker Marchant Stadium, that Andy Dirks will be the team’s primary leftfielder, and there was no need for another left-handed-hitting outfielder. It didn’t help Boesch that he miss