Irrepressibly quirky or frankly eccentric? Either way, an hour-plus in the company of the best of Jona Lewie is sufficient to induce fits of gleeful air piano playing in the most discriminating listener -- an hour-plus, that is, in the thrall of such offbeat pop classics as " Stop the Cavalry" & " Louise, the demented travelogue of Hallelujah Europa, the wallflowering anthem of You'll Always Find Me in the Kitchen at Parties, then on & on for 22 tracks until you reach the closing cover of