feat: create/delete seda object group for each binary and physical object

The object are not shown on the archive itself but on the group instead.

fix #13 (closed)

Group are listed in the profile :

However, there is no way to create object group directly. The group is created automatically for each binary/physical object.

Even if the binary object is not directly linked to the archive, it is now display in the tab:

On a group, the binary is also displayed:

--HG-- branch : seda21