Double-check Genesis4 source defaults for each namelist and lattice element

[ken-lauer]

• Namelists
  • ImportDistribution DOC: import_distribution settimewindow is by default false svenreiche/Genesis-1.3-Version4#193
  • Others seem OK - or at least not in conflict with our assumed defaults (e.g., gamma=0 means we'll always write gamma to the input file which is just fine)
• Lattice elements
• Rebuild dataclasses after the docs get fixed