fgm/php__symfony__book: FGM's version of the code suggested in the SF4 book. @ book

Frederic G. MARAND f8db3d0764 ORM: joining related records to reduce the query number.		7 lat temu
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index.html.twig	2c0d8bd04e ORM: DQL/QB subtleties with relations.	7 lat temu
product.html.twig	f8db3d0764 ORM: joining related records to reduce the query number.	7 lat temu