trac #16236: Merged with #16272
trac #16295 : Faster is_orthogonal_array
trac #16295: Doctests and review
trac #16295: Merged with 6.3.beta1
trac #16295: bugfix in wilson's construction
trac #16356: MOLS for n=18,57,154,276,298,342
trac #16295: Undoing useless """optimizations"""
trac #16295: Typo
trac #16391: Helper functions for OA constructions
trac #16391: Merged with 6.3.beta2
trac #16391: small improvement
trac #16295: Merged with 6.3.beta2
trac #16295: todo note
trac #16391: Independent Set problem with a LP
trac #16391: Small improvement
trac #16295: Bugfix
trac #16391: Merged with updated #16370
trac #16391: use OrthogonalArrayBlockGraph instead of OrthogonalArrayGraph
trac #16295: Merged with 6.3.beta3
fixed some small language typos and changed MOLS error messages into context that MOLS researchers will expect.