(svn r3197) Use a better bias so you can directly see the date range a disaster can happen in

disaster_cmd.c

@@ -941,21 +941,21 @@ static DisasterInitProc * const _disaster_initprocs[] = {
 	Disaster7_Init,
 };
 
-typedef struct {
+#define MK(a, b) { (a) - MAX_YEAR_BEGIN_REAL, (b) - MAX_YEAR_BEGIN_REAL }
-	byte min,max;
+static const struct {
-} DisasterYears;
+	byte min;
-
+	byte max;
-#define MK(a,b) {a-20,b-20}
+} _dis_years[] = {
-static const DisasterYears _dis_years[8] = {
+	MK(1930, 1955),
-	MK(30,55),
+	MK(1940, 1970),
-	MK(40,70),
+	MK(1960, 1990),
-	MK(60,90),
+	MK(1970, 2000),
-	MK(70,100),
+	MK(2000, 2100),
-	MK(100,200),
+	MK(1940, 1965),
-	MK(40,65),
+	MK(1975, 2010),
-	MK(75,110),
+	MK(1950, 1985)
-	MK(50,85),
 };
+#undef MK
 
 
 static void DoDisaster(void)