interaction_left/right() was broken in TIHamiltonian.
Allow creating Hamiltonians with missing interaction or local term.
Reorganize the creation of a default MPO in a fucntion called clear()
No need to create zero interactions now.
Fixed declaration for set_canonical_2_sites
New state simplification routine that works on pairs of sites, thus making the bond dimension more flexible.
Minor rewrites in the canonical forms.
Change the stop criteria in simplify()
Removed debugging statement.
The norm2() of an MPS is real and non-negative.
In rmpo_from_hamiltonian.cc, only add the interactions when they exist.
Removed unused files mps_normal*.cc
First cranky version of the Arnoldi method.
The intermediate dimension of the states has to be larger during the computation of the Arnoldi matrices.
ArnoldiSolver can also be created from a CMPO