Fixes #0000041: User IP in UserSession table have value "0.0.0.0" sometimes.
Problem happened, because extra fields (like IP address) were stored in Session object, and not in database. In "Session::SaveData" method additional fields were assumed as "non-changed" and were not written to database at all.
1. customized block redesign to match platform block layout 2. new method for setting/restoring fullscreen mode in admin 3. SetPopupSize tag added for "regional", "stylesheets" section templates 4. new tab design for "regional" section templates 5. Session class: missing attribute CachedSID declared, fixed duplicate session (with same sid) create attempt on session expiration resulting sql error 6. help icon removed from "blue_bar" block