#1550 Add a deviatoric version of the exponentialJ1J4 law.
This law is required by incompressible models that use the QuasiIncompressibleSecondPiolaKirchhoff. Typically the spherical heart model will make use of this.
This law is required by incompressible models that use the QuasiIncompressibleSecondPiolaKirchhoff. Typically the spherical heart model will make use of this.