Add EComm.Manufacturers component
Add news pictures, more statistics, fixes in EComm.Shippings
Major backend reorganization as OO modules
Per-category showcasing, templates improvements, Opera fixes

- Each category can now be displayed as showcase
- Improve templates complication and caching
- Improve styling in Opera
Add AForms for async form submission

AForms use JSON and asynchronous HTTP requests to submit forms in place,
without leaving the web page.
Add HTTP subsessions to separate multiple instances of a page

Necessary to distinguish among multiple tabs/windows open on the same
AForm.
Full UTF-8 support

Finish the conversion started by switching to AForms.
Convert more forms into AForms
Basic pictures management, support multiple News bars
Improve localization support
Convert more forms into AForms