The “Party Down” revival has been ordered to series at Starz, with six out of the shows seven original stars coming back for the six-episode installment.Lizzy Caplan is unable to return due to scheduling conflicts, but cast members Adam Scott (who is also an executive producer), Ken Marino, Jane Lynch, Martin Starr, Ryan Hansen and Megan Mullally will all reprise their original roles in the long-awaited new season of the comedy.Along with Scott, the revival’s executive producers include fellow