Generalize uniform mps restore_RCF and add restore_LCF. For use in mps_sandwich.
Make mps_sandwich work with blocking uniform MPS bulk states. Limit window length to multiples of block size for now. Remove shrink functions, which were pretty useless as currently implemented anyway.
Fix some debug messages for restore_LCF.
Simplify some get_ stuff and fix a bug.
Make tdvp_sandwich work with uniform blocking. Not everything is tested yet.
Cleanup restore_CF debug and fix a bug by not wrongly rescaling uni_l.l and uni_r.r.
Fix save and grow.