port root support over from fork
Support for full 3D root calculation will be ported over from the fork from Dorie https://ts-gitlab.iup.uni-heidelberg.de/mfels/dorie/tree/newrootversion. See the respective issue here: https://ts-gitlab.iup.uni-heidelberg.de/mfels/dorie/issues/1 This incorporates changes to richards_source.h (changing the class header and member functions), simulation.hh (for the uptated fsource header), operator_DG (addtionional class variables and source term moved to alpha_volume), aswell as simulation.cc (to incorporate the root setup routine) futhermore alteast output.hh will be changed to display the root locations
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