make the nitcatalog slightly more robust on person variations

make the nitcatalog slightly more robust on person variations

The various person-related fields were parsed verbatim.
So a slight change in spaces was enough to differentiate two persons.
Now the canonical person representation is used.

e.g. `Lucas Bajolet<r4pass@hotmail.com>` vs `Lucas Bajolet <r4pass@hotmail.com>
` is now the same person (hint: the change is the space between the `t` and the `<`).

Note that to present the original information,
 names/emails/url are still distinguished.

`Lucas Bajolet <r4pass@hotmail.com>`, `R4pass <r4pass@hotmail.com>
` and `Lucas Bajolet <lucas.bajolet@hotmail.com>
` are still 3 persons.

Signed-off-by: Jean Privat <jean@pryen.org>