bool fgSetBool(char const * name, bool val) { return false; }
bool fgGetBool(char const * name, bool def) { return false; }
SGPropertyNode* fgGetNode (const char * path, bool create) { return 0; }
+SGPropertyNode* fgGetNode (const char * path, int i, bool create) { return 0; }
float fgGetFloat (const char * name, float defaultValue) { return 0; }
+float fgGetDouble (const char * name, double defaultValue) { return 0; }
+float fgSetDouble (const char * name, double defaultValue) { return 0; }
static const float RAD2DEG = 57.2957795131;