Fix a bug in minimum(::NfOrdIdl). In case A has weakly normal generators, the second generator is allowed to be 0. In this case A.gen_one is the minimum up to sign.
Fix a bug in minimum(::NfOrdIdl).
In case A has weakly normal generators, the second generator
is allowed to be 0. In this case A.gen_one is the minimum
up to sign.

thofma/Hecke.jl