Make overworld_min configurable

mods/CORE/mcl_init/init.lua

@@ -101,8 +101,10 @@ if not superflat and not singlenode then
 	]]
 
 	-- Overworld
+	local mg_overworld_min_default = -128
 	mcl_vars.mg_overworld_min_old = -62
-	mcl_vars.mg_overworld_min = -128
+	mcl_vars.mg_overworld_min = tonumber(minetest.settings:get("mcl_overworld_min")) or mg_overworld_min_default
+
 	mcl_vars.mg_overworld_max_official = mcl_vars.mg_overworld_min + minecraft_height_limit
 	mcl_vars.mg_bedrock_overworld_min = mcl_vars.mg_overworld_min
 	mcl_vars.mg_bedrock_overworld_max = mcl_vars.mg_bedrock_overworld_min + 4

mods/MAPGEN/mcl_biomes/init.lua

@@ -1095,7 +1095,6 @@ local function register_biomes()
 		_mcl_palette_index = 22,
 	})
 
-
 	-- Savanna
 	minetest.register_biome({
 		name = "Savanna",

mods/MAPGEN/mcl_strongholds/init.lua

@@ -49,7 +49,7 @@ local function init_strongholds()
 			if superflat then
 				y = mcl_vars.mg_bedrock_overworld_max + 3
 			else
-				y = pr:next(mcl_vars.mg_bedrock_overworld_max+1, mcl_vars.mg_overworld_min+48)
+				y = pr:next(-50, -30)
 			end
 			local pos = { x = math.cos(angle) * dist, y = y, z = math.sin(angle) * dist }
 			pos = vector.round(pos)

settingtypes.txt

@@ -136,6 +136,9 @@ mcl_default_shadow_intensity (Default shadow intensity) float 0.33 0.0 1.0
 # See also: https://github.com/minetest/minetest/issues/95
 mcl_translucent_ice (Translucent ice) bool false
 
+# Overworld min deep (default: -128)
+mcl_overworld_min (Overworld min deep) int -128 -25000 -62
+
 # Whether to generate fallen logs in some biomes.
 # They might not always look pretty and have strange overhangs.
 mcl_generate_fallen_logs (Generate fallen logs) bool false