As courtroom drama goes, the upcoming trials in the quiet West Texas oasis of San Angelo should be humdingers: a dozen male members of a Mormom polygamist sect have been indicted on a bevy of charges, ranging from bigamy to sex with a child, stemming from a raid last year in which protective service officials removed more than 400 children from the Yearning For Zion compound. The trials are set to begin in October. But as every lawyer knows, this summer’s crop of pre-trial motions, however boring they may sound, will greatly shape the jury verdicts or any possible plea bargains by largely determining what is allowed to be used in the trials and what isn’t