Before this commit, one could edit its company_name (char) at will but this has no effect on the actual company name (commercial_partner_id that is a company). Thus once the partner is linked to a company, the information entered in the 'details' form will not be in synch with the details info on the '/my/home' page.

After this commit, we only allow edition of the 'Company name' field while the partner doesn't have a company set and display the company name once it is set.