Addressing (in code) users "root" and "Guest" using named constants

System users "root" (id = -1) and "Guest" (id = -2) are using in In-Portal since it's first version. Despite their popularity we always use their IDs in code and not thinking about creating named constants.

I say enough to mystic numbers and propose to create constants:

• USER_ROOT - for "-1" value
• USER_GUEST - for "-2" value

I've already did that and replaced all places, where I've found that magic numbers with proposed constants.