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Automatic tuning of chunk size in VMC driver

Vicentini Filippo requested to merge github/fork/wdphy16/auto_chunk into master

Created by: wdphy16

Implements #1054

In my original proposal it only works for drivers with _forward_and_backward implemented. If we want it to work also for TDVP, it's better to have a method in AbstractVariationalDriver that only does the computation once. For now I use TDVP._integrator.step, because TDVP.run or iter will do the computation many times until the target time is reached.

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