Added 20 sets to [DGC] Collection

Previews & DDL:

	[DGC] 2007.11 No.501 Ai Shinozaki 篠崎愛
	[DGC] 2007.11 No.502 Akina Aoshima 青島あきな
	[DGC] 2007.11 No.503 Aya Matsuda 松田綾
	[DGC] 2007.11 No.504 Kana Moriyama 森山花奈
	[DGC] 2007.11 No.505 Ai Sayama 佐山愛
	[DGC] 2007.11 No.506 Nao Yoshizaki 吉崎直緒
	[DGC] 2007.11 No.507 Masumi Okamura 岡村麻純
	[DGC] 2007.11 No.508 Yoshimi Hamasaki 浜崎慶美
	[DGC] 2007.11 No.509 Nodoka Ayukawa 鮎川のどか
	[DGC] 2007.11 No.510 Yuka Motohashi 本橋優華
	[DGC] 2007.11 No.511 Mami Hara 原真未
	[DGC] 2007.11 No.512 Rika Shiraishi 白石りか
	[DGC] 2007.11 No.513 Ai Miharu みはるあい
	[DGC] 2007.12 No.514 Natsuko Tatsumi 辰巳奈都子
	[DGC] 2007.12 No.515 Kana Kanisawa 蟹沢可名
	[DGC] 2007.12 No.516 Ayuko Iwane 岩根あゆこ
	[DGC] 2007.12 No.517 Mikie Hara 原幹恵
	[DGC] 2007.12 No.518 Mihiro みひろ
	[DGC] 2007.12 No.519 Sayuri Takamine 高嶺さゆり
	[DGC] 2007.12 No.520 Tomoyo Hoshino 星野智世