Vlasov-Poisson model solver

This simulation of the Vlasov-Poisson system dimensions uses

• NuFI algorithm
• deal.ii FEM package

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dimensions: 1x1v

notes:

• about 3 times slower than previous locator

status: Working, to be re-reviewed

Refinement working:

• grid versions saved on a vector
• solutions point to a version of the grid

todo:

• add ions