Optimize curated addresses (#945)

If the address book grows large, the method was really slow when mapping
contact addresses to contacts. We now restrict it to only work with the
contacts of the addresses it's working on.

See #944

app/controllers/projects_controller.rb

@@ -121,7 +121,8 @@ def curated_addresses(addresses)
     # build a hash from contact_id to all his addresses
     # eg. { 1 => ['123','456'], 2 => ['789'] }
     all_contacts = Hash.new { |hash,key| hash[key] = [] }
-    all_contacts = @project.contact_addresses.order(:id).inject(all_contacts) do |contacts, contact_address|
+    addresses_contacts = @project.contact_addresses.where(address: addresses).pluck(:contact_id)
+    all_contacts = @project.contact_addresses.where(contact_id: addresses_contacts).order(:id).inject(all_contacts) do |contacts, contact_address|
       contacts[contact_address.contact_id] << contact_address.address
       contacts
     end