Trans use of ndmax

[ameliajo]

in trans.h, ndmax is set equal to max(1e6,beta.size()). In s_table_generation, nds / nbt (goes by both names depending on which file we're in) is the number of S_t(a,b) values that were computed (determined by how quickly the S_t(a,bi) values get small).

According to s_table_generation, nds / nbt could be as big as ndmax. But when we inevitably go to sbfill.h, it throws an error if nds is greater than 0.5*ndmax. So that is already a problem that could be caught further upstream.

But what's more is that I don't particularly see why we need to define ndmax so early, could we just set ndmax equal to 2*nds? The only problem we'd have to work around is the fact that ndmax is used before we actually calculate nds, but we could mess with that a bit I think. Just want to avoid throwing an error to the user that could potentially be avoided. Also 1e6 is a lot of space that might not necessarily be necessary to reserve.