Relegation-threatened Cremonese said Wednesday that they have sacked coach Davide Nicola.     The Cremona side, who won promotion from the second tier last season, are third-bottom in Serie A with nine games to go after losing 4-1 at home to 16th-placed Fiorentina in a relegation battle on Monday.     The club have now brought in Marco Giampaolo, whose many former clubs include AC Milan.     Giampaolo, who has also coached Empoli, Torino, Sampdoria, Lecce and, 11 years ago, Cremonese itself, on