Torts — Joint and several liability — Limitation of actions — Trial court erred in applying joint and several liability to action arising from injury occurring in 2002, but not proceeding to trial until 2014, where 2011 amendment of section 768.81 made abolition of joint and several liability retroactive — Retroactive application of the statute is not unconstitutional in this case where plaintiff’s expectation, at time of accrual, to collect an undetermined amount of damages from defendant under theory of joint and several liability was not a vested right