add special evaluate code for FacElem/ fmpq and fmpz via coprime factorisation. If the product is "small" it can be found. Important for "_isunit()"
add special evaluate code for FacElem/ fmpq and fmpz via
coprime factorisation. If the product is "small" it can be found.
Important for "_isunit()"

thofma/Hecke.jl