Twyla Tharp planned a New York season on short notice. She’s a loner — relieved, she’s been saying in interviews, not to be saddled with a large institution, with “real estate.” Over the years, she’s proved that she can do just about anything she sets out to do, so what does she want to do now? Can she stay small while getting bigger and bigger? Will she seriously commit herself to revivifying her important work from the past, either under own banner or elsewhere?”