By THÉRÈSE MARGOLIS The “New Generation” interpretation of Jim Jacobs and Warren Casey’s 1972 hit musical “Grease,” now playing at the Teatro del Parque in Huixquilucan’s Interlomas Shopping Mall, is a nostalgic tribute to a bygone era when black leather jackets and flirty hoop skirts were in teenage vogue and high school dramas revolved around first-date romances and hotrod