(svn r25508) -Change: split unit localisation choice into a choice per type of unit, and move it to the advanced settings

-Feature [FS#5482]: have tractive effort in imperial (lbf) and metric (kgf) units
-Feature: have weights and volumes in imperial units (short tons, gallons)

src/table/gameopt_settings.ini

@@ -10,6 +10,7 @@
 static const uint GAME_DIFFICULTY_NUM = 18;
 static uint16 _old_diff_custom[GAME_DIFFICULTY_NUM];
 uint8 _old_diff_level;                                 ///< Old difficulty level from old savegames
+uint8 _old_units;                                      ///< Old units from old savegames
 
 /* Most of these strings are used both for gameopt-backward compatability
  * and the settings tables. The rest is here for consistency. */
@@ -44,6 +45,7 @@ SDTG_GENERAL = SDTG_GENERAL($name, $sdt_cmd, $sle_cmd, $type, $flags, $guiflags,
 SDTG_VAR     =     SDTG_VAR($name,                     $type, $flags, $guiflags, $var,          $def, $min, $max, $interval,        $str, $strhelp, $strval, $proc, $from, $to, $cat),
 SDT_NULL     =   SDT_NULL($length, $from, $to),
 SDTC_OMANY   = SDTC_OMANY(       $var, $type, $flags, $guiflags, $def,       $max, $full,            $str, $strhelp, $strval, $proc, $from, $to,        $cat),
+SDTG_OMANY   = SDTG_OMANY($name,       $type, $flags, $guiflags, $var, $def, $max, $full,            $str, $strhelp, $strval, $proc, $from, $to,        $cat),
 SDT_OMANY    =  SDT_OMANY($base, $var, $type, $flags, $guiflags, $def,       $max, $full,            $str, $strhelp, $strval, $proc, $from, $to, $load, $cat),
 SDT_VAR      =    SDT_VAR($base, $var, $type, $flags, $guiflags, $def, $min, $max,        $interval, $str, $strhelp, $strval, $proc, $from, $to,        $cat),
 SDT_END      = SDT_END()
@@ -112,11 +114,11 @@ max      = CURRENCY_END - 1
 full     = _locale_currencies
 cat      = SC_BASIC
 
-[SDT_OMANY]
-base     = GameSettings
-var      = locale.units
+[SDTG_OMANY]
+name     = ""units""
+var      = _old_units
 type     = SLE_UINT8
-flags    = SLF_NO_NETWORK_SYNC
+flags    = SLF_NOT_IN_CONFIG
 def      = 1
 max      = 2
 full     = _locale_units