prisms-center
Fix ownership issue for user inputs and pf tools
In main, we construct a pde operator using user inputs, then construct a pde problem using user inputs and the pde operator. This isn't airtight design as one could supply different user inputs to each object; the internal pointers aren't guaranteed to be identical. This would be avoided if we don't allow the pde operator to have user inputs as a member. If we don't want to change that, another alternative would be to make the operator type a template for pde problem, that way the operators would be constructed inside pde problem, and this wouldn't be an issue. It would also declutter main a bit.
In conjunction, if we want to remove user inputs or pf tools as members of pde operator, we would have to make pointers to them members of matrixfree operator and pass in the necessary info (namely current time and pf tools) into the operator through the compute_local calls.
Templating the operator template would also remove the need to construct a second operator for floats.