Optimize the relationship count

I am not able to code the sql to fetch it, but if you or someone understanding the schema of relationship can write one that returns the number of active relationship for a given contact, I would think it would be a worthwhile optimisation, as it's called everytime a contact is displayed.

If you find the sql, can wrap it in a method, as done already for groups and membership

ie adding a CRM_Contact_BAO_Relationship::getRelationshipCount ( $contactId ) ) with a neat sql query as done for the membership