Add setting for transfer payment mode from source, minus transfers.

This is to reduce large negative payments for the final leg.

src/table/settings.ini

@@ -1653,6 +1653,15 @@ strhelp  = STR_CONFIG_SETTING_FEEDER_PAYMENT_SHARE_HELPTEXT
 strval   = STR_CONFIG_SETTING_PERCENTAGE
 cat      = SC_EXPERT
 
+[SDT_BOOL]
+base     = GameSettings
+var      = economy.feeder_payment_src_station
+def      = false
+str      = STR_CONFIG_SETTING_FEEDER_PAYMENT_SRC_STATION
+strhelp  = STR_CONFIG_SETTING_FEEDER_PAYMENT_SRC_STATION_HELPTEXT
+cat      = SC_EXPERT
+patxname = ""economy.feeder_payment_src_station""
+
 [SDT_XREF]
 xref     = ""economy.day_length_factor""
 extver   = SlXvFeatureTest(XSLFTO_AND, XSLFI_SPRINGPP)