Lua: added helper.round function

changelog

@@ -82,6 +82,7 @@ Version 1.11.0-svn:
    * Changed: Extended support for toggle_button.
    * Fixed: wesnoth.find_reach does no longer replace a passed private lua
      proxy unit with the on-map unit at the same location
+   * new: helper.round function
  * Multiplayer:
    * Fix an accidental terrain type change in Isar's Cross
    * Fix attacker side being human in 6p_Team_Survival (bug #19400)

data/lua/helper.lua

@@ -368,4 +368,16 @@ function helper.deprecate(msg, f)
 	end
 end
 
+function helper.round( number )
+	-- code converted from util.hpp, round_portable function
+	-- round half away from zero method
+	if number >= 0 then
+		number = math.floor( number + 0.5 )
+	else
+		number = math.ceil ( number - 0.5 )
+	end
+
+	return number
+end
+
 return helper