Merge remote-tracking branch 'damfr/save-unique-id' into jgrpp

# Conflicts:
#	src/saveload/afterload.cpp
#	src/saveload/saveload.cpp

src/saveload/extended_ver_sl.cpp

@@ -93,6 +93,7 @@ const SlxiSubChunkInfo _sl_xv_sub_chunk_infos[] = {
 	{ XSLFI_BUY_LAND_RATE_LIMIT,    XSCF_NULL,                1,   1, "buy_land_rate_limit",       NULL, NULL, NULL        },
 	{ XSLFI_DUAL_RAIL_TYPES,        XSCF_NULL,                1,   1, "dual_rail_types",           NULL, NULL, NULL        },
 	{ XSLFI_CONSIST_SPEED_RD_FLAG,  XSCF_NULL,                1,   1, "consist_speed_rd_flag",     NULL, NULL, NULL        },
+	{ XSLFI_SAVEGAME_UNIQUE_ID,     XSCF_IGNORABLE_ALL,       1,   1, "savegame_unique_id",        NULL, NULL, NULL        },
 	{ XSLFI_NULL, XSCF_NULL, 0, 0, NULL, NULL, NULL, NULL },// This is the end marker
 };