clean up pypolybori

[fchapoton]

that was recently included in sage without much care about refreshing its code..

reference : #30332

CC: @kiwifb @orlitzky @tscrim @mkoeppe

Component: refactoring

Author: Frédéric Chapoton

Branch/Commit: 51592e0

Reviewer: Travis Scrimshaw

Issue created by migration from https://trac.sagemath.org/ticket/30618

[fchapoton]

Branch: u/chapoton/30618

[fchapoton]

Commit: dc0b9ad

[fchapoton]

New commits:

dc0b9ad

cleaning up pypolybori (start of the task)

[sagetrac-git]

Changed commit from dc0b9ad to e2ad5e0

[sagetrac-git]

Branch pushed to git repo; I updated commit sha1. New commits:

e2ad5e0

fix back imports for the moment

[sagetrac-git]

Branch pushed to git repo; I updated commit sha1. New commits:

d752eab

remove offending import all

[sagetrac-git]

Changed commit from e2ad5e0 to d752eab

[sagetrac-git]

Branch pushed to git repo; I updated commit sha1. New commits:

df037c2

more import cleanup in pypolybori

[sagetrac-git]

Changed commit from d752eab to df037c2

[sagetrac-git]

Changed commit from df037c2 to 6b19700