Add fb_vector_interface as base class for fixed-Nr_roots and general vectors
Add fb_vector_interface as base class for fixed-Nr_roots and general vectors

mancoast/cado-nfs,mancoast/cado-nfs,mancoast/cado-nfs,mancoast/cado-nfs,mancoast/cado-nfs,mancoast/cado-nfs,mancoast/cado-nfs