File

util.stanza: Add add_error() to simplify adding error tags to existing stanzas Some fiddling is required now in error_reply() to ensure the cursor is in the same place as before this change (a lot of code apparently uses that feature).

local record mod
	sand : function (string, string) : string
	sor : function (string, string) : string
	sxor : function (string, string) : string
end
return mod