A look back at the Bicentennial year from a Beatles perspective.     "Wings Over America" frequently overshadows everything else, but there were plenty of other things going on.     Sid Bernstein and Bill Sargent offered the four men that were once Beatles seven (and eight!) figures to do a concert or two.     John Lennon started his househusband era while pondering his future as a recording artist.    Paul McCartney (and Wings), George Harrison and Ringo Starr each released a solo album, Capitol ramped up its reissue series, and Tony Palmer had the bright idea of building a feature around the BeeGees doing a Beatles cover (no, not that one).