Release v0.14 tracker #525

In an attempt to work more concretely towards a new MPSKit release, I'll add a list of things I aim to include below, comments and suggestions more than welcome.

Fixes

• FixTaylorCluster for non-square (finite) Hamiltonians #511
• Tests for Hamiltonian derivatives and long-range models #493
• Canonicalizing Hamiltonians throws an exception when sites are decoupled #522
• variance() throws SpaceMismatch for real-scalartype long-range InfiniteMPOHamiltonian #524

Interface changes

• Fix Multiline (MultilineMPS/MultilineMPO) correctness and API inconsistencies #508
• Overhaul on error reporting of algorithms #512

Documentation

• DocumenterVitePress and documentation stability #527

There are a number of additional features that I want to finish soon-ish, but I think these all qualify as non-breaking so can be worked on with less time pressure.