April 5 (Reuters) - Britain's FTSE 100 index is seen opening 98 points higher at 7,132 on Thursday, according to financial bookmakers. * FAROE/DNO: Norwegian oil firm DNO, which early on Wednesday bought a 15.4 percent stake in Faroe Petroleum, said after market close that it aims to further raise its holdings in the British company to around 25 percent. * ANGLO AMERICAN: The Brazilian state of Minas Gerais slapped a 125.6 million real ($37.73 million) fine on Anglo American on