Improve technical views

Under the "Administration" entry, there are many model that are displaying technical information like model or field names.
This is mainly because it is easier to create them from XML using the string as key than having to search for the corresponding entry in the ir.model or ir.model.field.

But this is not great for the user because he is missing the relation field to browse them.

I propose to add Many2One Function fields using those raw data as source, and to use those fields for display. In addition we could add a non-primary based foreign key constraint on the field to improve data integrity.