Describe intra and inter-species target variants as part of same family

Until now, we use name attribute to group "same" target (e.g. 18S or 25S) in select/search fields

However, when having variants of the same target in the same organism. We can't rely anymore to this attribute as name will vary according to variant.

• We need to add an attribute like, or a link to, family or clan from rfam
• We must also refers to rfam in additional data.