various: add roots(f, K) to get roots in K          add support for non-square-free f in factor          use max_roots in hasroot and root          allow use_lll in roots          comments
various: add roots(f, K) to get roots in K
         add support for non-square-free f in factor
         use max_roots in hasroot and root
         allow use_lll in roots
         comments

thofma/Hecke.jl