As the title says.

Because this method also needs to shorten a matrix in the middle of OA_from_Vmt, it is split into QDM_from_Vmt and OA_from_quasi_difference_matrix (which was already called).

Nathann

Depends on #16582
Depends on #16797

CC: @videlec

Component: combinatorial designs

Author: Nathann Cohen

Branch/Commit: 24c4f7f

Reviewer: Vincent Delecroix

Issue created by migration from https://trac.sagemath.org/ticket/16604