This commit fixes U4-1115, by allowing other backend admin users than the root user, the possibility of allowing access to not used sections.

Right now the EditUser.aspx.cs codebehind only lists out sections the currently logged in user already has access to, unless the currently logged in user is the "root user", ie. the user with Id = 0
Merge pull request #488 from jhauge/7.2.0

This commit fixes U4-1115