Various additions

* Added intermediate connections for vertical digilines
* Added protection support to buttons and wall knobs (optional, defaults to off)
* Added the ability to manually control the button light (optional, defaults to off)

internal.lua

@@ -1,3 +1,5 @@
+digistuff.mesecons_installed = minetest.get_modpath("mesecons")
+
 digistuff.rotate_rules = function(rulesin,dir)
 	local rules = {}
 	for k,v in ipairs(rulesin) do rules[k] = v end
@@ -42,3 +44,14 @@ digistuff.rotate_rules = function(rulesin,dir)
 		return {}
 	end
 end
+
+digistuff.check_protection = function(pos,player)
+	assert(type(pos) == "table","Position must be a table")
+	assert(type(player) == "string" or type(player) == "userdata","Invalid player specified")
+	if type(player) == "userdata" then player = player:get_player_name() end
+	if minetest.is_protected(pos,player) and not minetest.check_player_privs(player,{protection_bypass=true}) then
+		minetest.record_protection_violation(pos,player)
+		return false
+	end
+	return true
+end