Misc improvements for "General tab"

[nghuuphuoc]

[soulevilx]

We'll re-arrange these fileds :) Zo2

Global [Sidebar]
    Basic [tab]
        <global>_site_name [text]
        <global>_site_slogan [text]
        <global>_site_copyright [textbox]
        <global>_site_logo              
        <global>_site_logo_retina
        <global>_site_enable_rtl
    Advanced [tab]
        <global>_site_logo_position
            none
            top
            footer
        <global>_site_favicon
        <global>_site_enable_gototop
    Font [tab]
        <font>_body_xxx
Layouts [Sidebar]
    Profiles [top]
    Builder [tab]
    Themes [tab]
        Presets
        Preset settings
        Layout style
            Full width
            Boxed
    Menu            
    Assignment [tab]
Advanced [sidebar]
    Basic [tab]
        <advanced>_cache_interval
        <advanced>_hide_frontpage_component
        <advanced>_load_jquery
        <advanced>_compress_js
        <advanced>_compress_css
        <advanced>_merge_js
        <advanced>_merge_css
    SEO [tab]
        <advanced>_google_xxx
        <advanced>_google_analytics_code
    Extends
        <advanced>_enable_comments
        <advanced>_enable_socialbuttons_facebook
        <advanced>_enable_socialbuttons_google
    Developer [tab]
        <advanced>_enable_debug_mode
        Clear cache [ button ]
About [sidebar] ( Show "widget" icon if have update or announcement ]
    Zo2 Framework
        Intro
        Credit
        ...
    Update
        Find Update

[phuongnd]

it's done!