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WIP: Veering quadrangulations and Ferenczi-Zamboni / Delecroix-Ulcigrai inductions

Vincent Delecroix requested to merge quadrangulations into master

This merge request implements a special case of veering triangulations and flip sequences corresponding to the Ferenczi-Holton-Zamboni / Delecroix-Ulcigrai induction. The combinatorics is simple enough so that it is possible to list the length spectrum.

  • Fix interaction with veering triangulations code. Many conventions are different.
  • Make better estimate on dilatations of pseudo-Anosov to improve length spectrum listing. Currently only combinatorial bounds are used and there is no guarantee that the length spectrum is complete.

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