As a user I want to add a comment to a series

[php-coder]

This feature was requested by our user.

One point to think about: should a user add a comment to a whole series or rather to its instance in the collection?

[php-coder]

One point to think about: should a user add a comment to a whole series or rather to its instance in the collection?

Because admin already has such ability and it works for a series rather than an instance, let's implement it similarly for users. Easy migration at least. Comments to the instances can be added later anyway.

[php-coder]

Should we also remove possibility to add a comment during a series creation?

[php-coder]

Should we also remove possibility to add a comment during a series creation?

Yes, we should.

[php-coder]

Because admin already has such ability and it works for a series rather than an instance

Also, such comments are visible to all admins, while the new implementation will bind all existing comments to a single admin user.