Wrap `query_disc` to use lon, lat, and radius in degrees.

def ang2disc(nside, lon, lat, radius, inclusive=False, fact=4, nest=False):
    """
    Wrap `query_disc` to use lon, lat, and radius in degrees.
    """
    vec = ang2vec(lon,lat)
    return query_disc(nside,vec,radius,inclusive,fact,nest)