Branch test using extensive and intensive variables
Bug fixed in viscoelastic
Viscoelastic version tested without source (relaxation to equilibrium)
- for G=0 with Stoker and Ritter
- for G>0 with Stoker (Ritter: blow up)
Corrected viscoelastic: Ritter with G>0 OK !
Viscoelastic just before topographic sources
Added flat-inclined-plane source term (using theta as angle parameter)
PS: not very clean, shoudl be fixed later on