It started out as a fashion show for full figured gals, but Roseanne Barr the mistress of the public spectacle, quickly turned Tuesday's Lane Bryant fashion show into a demo for the disenfranchised. 'Are there any fat people in the house,' brayed the washed up comic. Cheers rose from the crowd at the Manhattan Center display of plus size lingerie and 'cabaret attire.''Are there any gay people in the house?' she asked. Louder cheering. 'What about the Jews?' she continued. Still more cheers.Roseanne (who has slimmed down a bit herself) wen on to tell of her love for the 'Hitler...