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Ground state calculation using imaginary time propagation

Vicentini Filippo requested to merge github/fork/femtobit/feature/time_evolution into feature/time_evolution

Created by: femtobit

This PR adds a work-in-progress implementation of ground state calculations using imaginary time propagation with the Runge-Kutta time-stepping already implemented in the feature/time_evolution branch.

(It could probably use some more tests and documentation before merging to master, but I think this is a good time for some initial feedback.)

I have added a tutorial example for the 1d Ising model, which gives the same result for the ground state energy as the RBM version. (Currently the example uses N=12 as larger N were slow. The runtime was dominated however by the construction of the sparse matrix, so that should be solved by PR #54.)

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