Introduced new model of AliasEntry

[userlocalhost]

This adds new model AliasEntry that indicates alias of target Item (Entry)

[hinashi]

CREATE TABLE `entry_aliasentry` (`id` integer AUTO_INCREMENT NOT NULL PRIMARY KEY, `name` varchar(200) NOT NULL, `entry_id` integer NOT NULL);
ALTER TABLE `entry_aliasentry` ADD CONSTRAINT `entry_aliasentry_entry_id_8ec4a5a4_fk_entry_entry_aclbase_ptr_id` FOREIGN KEY (`entry_id`) REFERENCES `entry_entry` (`aclbase_ptr_id`);