8 Terror Suspects Appear in British Court LONDON - Eight suspects, including a man identified by the United States as a senior al-Qaida figure, appeared in a London court under heavy guard Wednesday as police investigated their alleged plot to commit murder and to cause mayhem with chemical, biological or radioactive materials.    A prosecutor also said police were searching about 100 computers and thousands of files, suggesting a protracted investigation that could produce more charges against the suspects, who were seized in raids across England two weeks ago...