Implementation of LocalHyperDualStiffness
requested to merge jonathan.drechsel_at_mailbox.tu-dresden.de/dune-elasticity:feature/localhyperdualstiffness into master
- implementation of hyper-dual numbers is added
- LocalHyperDualStiffness is a new alternative to LocalADOLCStiffness that uses hyper-dual numbers instead of AD by ADOL-C
- localhyperdualstiffnesstest verifies the results of LocalHyperDualStiffness