YAOUNDE, CAMEROON — Chad’s Constitutional Council has ignored opposition calls to set aside results of last month’s parliamentary elections for gross irregularities and fraud, and proclaimed the ruling party of Chad’s president, Field Marshal Mahamat Idriss Deby, the winner. Officials said nominations for senatorial elections to end the transition are open, but the opposition insisted another transitional government should be formed and transparent elections organized to end the three-decade Deby family rule. Officials in Chad said opposition leaders assembled Wednesday in the capital, N’djamena, to protest the election results published Tuesday by the Constitutional Council, the central African nation’s highest