better SIDs and integers handling in config files

src/,,config_generic.s

@@ -59,6 +59,8 @@
 ;; #CONFIG# SID_3RD_ADDRESS            NO
 ;; #CONFIG# SID_D4XX                   NO
 ;; #CONFIG# SID_D5XX                   NO
+;; #CONFIG# SID_D6XX                   NO
+;; #CONFIG# SID_D7XX                   NO
 
 
 ; Keyboard settings