Recently, a rather pernicious piece of disinformation has gained Internet traction falsely claiming Abraham Lincoln had owned slaves. He didn’t and anyone who suggests otherwise should lose all credibility. While the degree of Lincoln’s anti-slavery beliefs evolved and hardened during his public life, he always found chattel slavery morally reprehensible. Lincoln also resided in free states, except for his childhood, when his family lived in such extreme, grinding poverty, the prospects of owning slaves were leagues beyond their reach, even if they were not philosophically opposed to the practice. The sheer magnitude of the future president’s rise from obscure poverty to the Oval Office is fully explored in the three-night docudrama “Abraham Lincoln,” which premieres Sunday, Feb. 20 on History Channel. Directed by Malcom Venville (who also helmed the entertaining narrative films “Henry’s Crimes” and “44 Inch Chest”), “Abraham Lincoln” follows executive producer Doris Kearns Goodwin’s book “Leadership: In Turbulent …