Off by one error in SIS length bound check

[mark-schultz]

Currently, calling

SIS.estimate(SIS.Parameters(n=1024, q=8380417, length_bound=8380417 - 1, m=2304, norm=+Infinity))

yields

Algorithm functools.partial(<estimator.sis_lattice.SISLattice object at 0x760b375761d0>, red_cost_model=<estimator.reduction.MATZOV object at 0x760b37540760>, red_shape_model='gsa') on SISParameters(n=1024, q=8380417, length_bound=8380416, m=2304, norm=+Infinity, tag=None) failed with SIS trivially easy. Please set norm bound < q.

despite the norm bound being < q. If one instead calls

SIS.estimate(SIS.Parameters(n=1024, q=8380417, length_bound=8380417 - 2, m=2304, norm=+Infinity))

one gets an estimate, as expected.