Added 20 sets to [DGC] Collection

Previews & DDL:

	[DGC] 2007.09 No.481 Koisaya 恋小夜
	[DGC] 2007.09 No.482 Yuria 由梨亜
	[DGC] 2007.09 No.483 Rika Goto 後藤梨花
	[DGC] 2007.09 No.484 Ayumi Ochi 越智亜由美
	[DGC] 2007.09 No.485 Erika Minami 美波映里香
	[DGC] 2007.09 No.486 Ai Oota 太田愛
	[DGC] 2007.09 No.487 Asuka Minami 南明日香
	[DGC] 2007.09 No.488 Nao Matsuzaka 松坂菜央
	[DGC] 2007.10 No.489 Yuka Mizusawa 水沢友香
	[DGC] 2007.10 No.490 Hikari Yamaguchi 山口ひかり
	[DGC] 2007.10 No.491 Nozomi Araki 荒木のぞみ
	[DGC] 2007.10 No.492 Yui Minami 南結衣
	[DGC] 2007.10 No.493 Minori Hatsune 初音みのり
	[DGC] 2007.10 No.494 Kotone Aisaki 相崎琴音
	[DGC] 2007.10 No.495 Tomoyo Hoshino 星野智世
	[DGC] 2007.10 No.496 Nao Matsuzaka 松坂菜央
	[DGC] 2007.10 No.497 Shiori Yokoi 横井詩織
	[DGC] 2007.10 No.498 Kaori Ishii 石井香織
	[DGC] 2007.10 No.499 Erika Ura 浦えりか
	[DGC] 2007.10 No.500 Shiori Kawana 川奈栞