2.1.1

Breaking changes

• Change fracture load levels used for slope k_1 and scatter T_N
  estimation. Now only fractures in the finite_zone are used for estimation
  and not all fractures (in finite_zone and infinite_zone). Change based on
  findings in DIN50100:2022-12. (#80, #101)

  (see this discussion)

• Rename FatigueData.fatigue_limit to finite_infinite_transition

New features

• Add option to manually set fatigue_limit (now renamed) for Woehler curve
  estimation. (#73)

Improvements / bug fixes

• Rainflow counters work with pd.Series of all index type (#69)
• Improved documentation
• Fixed confusing load matrix after mean stress transformation (#105)
• Massive performance improvements of three point and four point rainflow
  counters.
• The Wöhler analyzer now ignores irrelevant pure runout levels (#100)