Minor change of options in geostat

geostat.cpp

@@ -42,7 +42,7 @@ int main(int argc, char** argv) {
 #include "config_user.h"
 
 	int o;
-	while ((o = getopt(argc, argv, "g:d:pu:MDOH:s:m:eLTYh")) != -1)
+	while ((o = getopt(argc, argv, "g:d:pu:MDOH:s:m:eLTYh?")) != -1)
 		switch (o) {
 			case 'd':
 				try {