Spa graphic updates

Last Upd. 24/11/05: addons by Seegert

	Circuit is updated with addons by Sébastien Riou (see Racesimcentral thread NEW Textures for SPA-FRANCORCHAMPS & BREMGARTEN). 1-download "SPA-FRANCORCHAMPS Mod" Ver. 1.1 October 2003 4'122 Ko from modif. 2-extract files into gpl/tracks/spa directory.
	Realistic horizon by Seegert, from RSC thread Spa - getting it "right". 1-download seegert spa horizon version 1.2 sept 04.zip and seegert spa additionals 1.zip and extract all their files into gpl/tracks/spa dir, overwriting when requested. 2-download english flag + bosch battery.zip and extract all its files into gpl/tracks/spa dir, overwriting when requested.