Modify init.lua to allow normal player usage.

Changes made:
* Put in new chatcommand /whereami to allow normal players to turn on / off player location coords without needing special privs.
* Made Debug Coords level 2, Player Location level 1, and Off level 0. (Allows turning the location off.)
* Put in nil value check into get_text, to prevent errors caused by definitions accidentally not returning a value.
* Cached pairs, ipairs, and table because the code is called every 0.63 seconds, and it made sense to do so. (Hopefully, will help
  to mitigate the added load on framerate.)

mods/HUD/mcl_info/init.lua

@@ -7,6 +7,9 @@ local get_connected_players = minetest.get_connected_players
 local get_biome_name        = minetest.get_biome_name
 local get_biome_data        = minetest.get_biome_data
 local format                = string.format
+local pairs                 = pairs
+local ipairs                = ipairs
+local table                 = table
 
 local min1, min2, min3 = mcl_vars.mg_overworld_min, mcl_vars.mg_end_min, mcl_vars.mg_nether_min
 local max1, max2, max3 = mcl_vars.mg_overworld_max, mcl_vars.mg_end_max, mcl_vars.mg_nether_max + 128
@@ -63,11 +66,14 @@ local function get_text(player, bits)
 	local r = ""
 	for _,key in ipairs(fields_keyset) do
 		local def = mcl_info.registered_debug_fields[key]
+		if def then
 			if def.level == nil or def.level <= bits then
 				r = r ..key..": "..tostring(def.func(player,pos)).."\n"
 			end
+		else
+			r = r ..key..": <Unknown Field>\n"
+		end
 	end
-
 	return r
 end
 
@@ -115,7 +121,7 @@ minetest.register_on_leaveplayer(function(p)
 end)
 
 minetest.register_chatcommand("debug",{
-	description = S("Set debug bit mask: -1 = disable, 0 = player coords, 1 = biome name, 2 = coordinates, 3 = all"),
+	description = S("Set debug bit mask: 0 = disable, 1 = player coords, 2 = coordinates, 3 = biome name, 4 = all"),
 	params = S("<bitmask>"),
 	privs = { debug = true },
 	func = function(name, params)
@@ -130,6 +136,25 @@ minetest.register_chatcommand("debug",{
 	end
 })
 
+-- register normal user access to debug levels 1 and 0.
+minetest.register_chatcommand("whereami", {
+	description = S("Set location bit mask: 0 = disable, 1 = coordinates"),
+	params = S("<bitmask>"),
+	-- privs = { },
+	func = function(name, params)
+		local player = minetest.get_player_by_name(name)
+		if params == "" then
+			return true, "Location bitmask is " .. player_setting(player)
+		end
+		local loc_lev = math.floor(tonumber(params) or default_debug)
+		if loc_lev < 0 or loc_lev > 4 then
+			minetest.chat_send_player(name, S("Error! Possible values are integer numbers from @1 to @2", 0, 1))
+			return false, "Current bitmask: " .. player_setting(player)
+		end
+		return true, "Location bit mask set to " .. player_setting(player, loc_lev)
+	end
+})
+
 mcl_info.register_debug_field("Node feet",{
 	level = 4,
 	func = function(pl,pos)
@@ -155,6 +180,14 @@ mcl_info.register_debug_field("Biome",{
 })
 
 mcl_info.register_debug_field("Coords", {
+	level = 2,
+	func = function(pl, pos)
+		return format("x:%.1f y:%.1f z:%.1f", pos.x, pos.y, pos.z)
+	end
+})
+
+mcl_info.register_debug_field("Location", {
+	level = 1,
 	func = function(pl, pos)
 		local report_y = 0
 		-- overworld
@@ -174,6 +207,7 @@ mcl_info.register_debug_field("Coords", {
 			return format("End: x:%.1f y:%.1f z:%.1f", pos.x, report_y, pos.z)
 		end
 
+		-- outside of scoped bounds.
 		return format("Void: x:%.1f y:%.1f z:%.1f", pos.x, pos.y, pos.z)
 
 	end