The child is father of the Man. After watching two-and-half-hours of the Amitabh Bachchan-starrer ‘Paa’, William Wordsworth’s lines from ‘The Rainbow’ never felt more true. Or correct. Or contextual. Or more Bachchan. (Not necessarily in that order though!) Cause these, after all, were simple lines that had inspired many literary, cinematic and musical offerings over…