this branch implements the variational ccd
doing some debugging
pretty sure T2 works now
T2 works
fixed some bugs already...
it seems that the hamiltonian works!
steepest descent vccd works, really slow though
added input output
definitely something wrong ...
switching to bug_compress branch
whatever
added Renop class
renormalized stuff man
renormalized operators work
added gradient construction stuff
trying to get the gradient efficiently
everything now works with the mpsxx lib
just messing about
T1_2_mpo list works!
what happened?