Make new integrator work for real time evolution.
Only do sanity checks when requested.
Return eta_BB_sq from calc_BB
Finish fixing etas in tdvp_gen. Make calc_B() calculate the complete B. Split out calc_B_n().
A few clean ups and some docs.
Fix eta vs. eta_sq in tdvp_sandwich.
In dynamics, update before returning in max_itr cases.
Make find_ground expand before CG.
Leave initial normalisation of l and r alone.
Fix some eta stuff in uniform.
Really expand up to maxD in uniform case.
Some uniform CG fixes and tweaks.
Update the state when importing in uniform case.
In find_ground, expand first with imaginary time evolution, then use CG.
Use more ncv by default in correlation length calculation.