US7 As a talent I want to have an opportunity to change status of my proofs from "draft" to "published" or "hidden"

[Maslyna]

Acceptance criteria:

• Change status from “published“ or “hidden“ to “draft“ is impossible;
• It is possible to change status from “hidden“ to “published“ and back;
• Proofs with status “published“ should be displayed on a public page with proofs and on a personal profile;
• Proofs with status “hidden“ should be displayed only for owner;