allow special attributes in the provider services form
keep the current formula on update
this was only for debug
enable to list services in a page
add service for page in the admin part
add service_id to attribute accessible
change the links in the nav menu
update the root route
update admin part
change the link to pages in the admin part
update the provider_services view
enable to edit first and last part
update the list of services in pages
enable to send messages to service providers
enable paintings to have many sources
correct sources to provenances
use check boxes instead select in the spec
keep the source in the form object
remove old files
remove `from` for paintings