Add script to regenerate all reference files.
Regenerate netcdf files
Add utf-8 encoding
Replace properties with lazy_properties
Cosmetic changes
Preliminary support for nspinor==2
Use lazy_property for ebands._auto_klabels
Move mixin classes to abipy.core.mixins
Regenerate reference files
Regenerate sigres file with Sigma(w)
Call abiopen in a context manager if possible