mzd_echlonize() on matrix windows

[Martin Albrecht]

This should work:

A = mzd_init(m, n);
mzd_randomize(A);
W = mzd_init_window(A, rl, cl, m, n);
mzd_echelonize(W, 1);
mzd_free_window(W);

but is reported not working at https://groups.google.com/d/msg/m4ri-devel/0IYNIZDJxVc/3F90xnetAwAJ

[Martin Albrecht]

Looks like it works for columns % 128 == 0