What a lousy year for the Mets — and the ex-Mets. First came the protracted woes of former car-wash king and ’86 World Series hero Lenny Dykstra, who went bankrupt and had to sell his Series ring. Then Jerry Koosman, ’69 hero, went away for tax evasion. Now Ron Darling is revealed to owe $544,197 in state and federal taxes; California and the IRS have liens against him, and New York has issued a tax warrant. And he’s one of the educated ex-Mets!