78. The provisions of articles 1407, 1408 and 1421 of the new Code concerning, respectively, the remedies available to the person whose consent is vitiated, the power granted to the court to maintain, in certain cases, a contract in respect of which a demand for annulment has been made, and the presumption of relative nullity of a contract which does not meet the necessary conditions of its formation, are applicable to contracts formed before 1 January 1994.