I believe I did answer your questions but let's deal with them again:
Udruga Animi wrote:
But I would still like to know the answer to my question. Is there a way to define which particles, as well as their configuration, are gonna be inside layout when I create/add new outline?
No, not from the outline, other that the option to assign that whole outline to a specific page. Particles themselves are not working to joomla ACL. If you want to assign which modules appear then you use joomla module manager as you always have. Particles can exist inside a "Gantry 5 module particle" so the behave just like any other module, which means you can do the same with them too.
Udruga Animi wrote:
As I said in first post, in earlier versions of Gantry5, what ever you set up/configure in layout of base outline it would be copied into the layout of new outline you create/add. Since there is no layout in base outline now I don't know how to do it anymore.
No, it would not, that is incorrect, the base outline layout did absolutely nothing, that is why we removed it. It was confusing to members and every one made up there own theory on what it did - none of which were correct. We will be introducing the base outline layout again in a future release once we have decided how it will work (properly) and completed the development. If you want a new outline to copy from another use the "duplicate" button on the existing outline, this will give your the same styles and layout settings.
I hope that clarifies that now?
Regards, Mark.