Add setting for linkgraph times to be in non daylength scaled days.

Savegame format change for link graph jobs.
Change link graph scheduler to support more than one operation
per day, on _date_fract ticks other than SPAWN_JOIN_TICK.

src/table/settings.ini

@@ -743,6 +743,15 @@ str      = STR_CONFIG_SETTING_LINKGRAPH_TIME
 strval   = STR_JUST_COMMA
 strhelp  = STR_CONFIG_SETTING_LINKGRAPH_TIME_HELPTEXT
 
+[SDT_BOOL]
+base     = GameSettings
+var      = linkgraph.recalc_not_scaled_by_daylength
+def      = false
+str      = STR_CONFIG_SETTING_LINKGRAPH_NOT_DAYLENGTH_SCALED
+strhelp  = STR_CONFIG_SETTING_LINKGRAPH_NOT_DAYLENGTH_SCALED_HELPTEXT
+extver   = SlXvFeatureTest(XSLFTO_AND, XSLFI_LINKGRAPH_DAY_SCALE)
+patxname = ""linkgraph_day_scale.linkgraph.recalc_not_scaled_by_daylength""
+
 [SDT_VAR]
 base     = GameSettings
 var      = linkgraph.distribution_pax