v0.4.4

DFTK v0.4.4

Diff since v0.4.3

Closed issues:

• Error showing basis without kshift (#554)

Merged pull requests:

• Turn generators into arrays (#556) (@antoine-levitt)
• Implement Marzari-Vanderbilt-DeVita-Payne (cold) smearing (#557) (@azadoks)
• Fix typo (#559) (@haampie)
• new example using AD to compute error bounds for forces (#561) (@gkemlin)
• [WIP] Zygote SCF (#563) (@niklasschmitz)
• Generalize PowerNonlinearity to LocalNonlinearity (#564) (@antoine-levitt)
• Simplify xc fallbacks, allow second derivatives, remove codegen (#565) (@antoine-levitt)
• Reformulate readme (#566) (@mfherbst)