Needed access to mesh displacements at their vertices so a new quadrature rule was needed. This required small_classes.h to have that derived class inherit from FullScratchData. A loop was written in the assemble_fluid for each cell function to update that cell's coordinates (and undo changes from previous mesh updates). Also, the calculation of mesh_velocity was made as well as the instantiation of the mesh_displacement, old_mesh_displacement, and mesh_velocity.