Revert "adding directory table to sql scripts"

This reverts commit a7e0ef30fa8a061920c22e4cda6e6e92e83b7a92.

config/database/mysql/v3.0-to-v3.1.sql

@@ -2,20 +2,4 @@ ALTER TABLE `USER` ADD COLUMN `authentication_type` CHAR(1) CHARACTER SET utf8 N
 AFTER `colaborator_id`;
 
 ALTER TABLE `USER` ADD COLUMN `authenticator_uri` VARCHAR(255) CHARACTER SET utf8
-AFTER `authentication_type`;
-
-CREATE TABLE DIRECTORY (
-  id             INTEGER           NOT NULL PRIMARY KEY AUTO_INCREMENT,
-  name           VARCHAR(255)
-                 CHARACTER SET utf8 NOT NULL,
-  description    VARCHAR(255)
-                 CHARACTER SET utf8 NOT NULL,
-  creator_id     INTEGER            NOT NULL,
-  FOREIGN KEY (creator_id) REFERENCES USER (colaborator_id)
-    ON DELETE CASCADE
-    ON UPDATE NO ACTION
-)
-  CHARACTER SET utf8;
-
-ALTER TABLE `MINDMAP` ADD COLUMN `directory_id` INTEGER NOT NULL DEFAULT '/'
-AFTER `last_editor_id`
+AFTER `authentication_type`;