The FilterSelectorsService is now able to create multiple independent
lists of selectors. These lists are explicitly given to the
filter-selector directive.
For example a group's page has one set for the group's producers and one
set for the group's shops.
The enterprises have related producers and hubs that need to be
dereferenced. Therefore, we need a bigger set of enterprises to be
loaded. Injecting all enterprises is simple and doesn't require changes
if the set of needed enterprise data is growing in future.
