Quality Control (2 Lp's)Jurassic 5: Chali 2NA, Zaakir, Akil, Marc 7, Cut Chemist, DJ Nu Mark. Additional personnel: Roberto Morena (bass); Bernard Purdie (drums). Producers: DJ Nu Mark, Cut Chemist, Shafiq Husayn. Engineers: Stefan Neary, Mark Ellis, Cut Chemist. Forgoing the grim lyrical concerns of many of their hip hop contemporaries, Los Angeles' Jurassic 5 point up a more carefree time in the music's history. Recalling the youthful irreverence of the Native Tongues