ROXIE AND THE HOOLIGANS Do not panic.    Lord Thistlebottom's Book of Pitfalls and How to Survive Them has taught Roxie Warbler how to handle all sorts of situations. If Roxie's ever lost in the desert, or buried in an avalanche, or caught in a dust storm, she knows just what to do. But Lord Thistlebottom has no advice to help Roxie deal with Helvetia's Hooligans, the meanest band of bullies in school.   Then Roxie finds herself stranded on a deserted island with not only the Hooligans but also a pair of crooks on the lam, and her survival skills may just save the day -- and turn the Hooligans into surprising allies.