Changes

* List of Files needed to be modified:src - [[ PostgreSQL_Adapter-nexj/SchemaManger | PostgreSQLSchemaManager.java ]] --- ([[SchemaBackup]]) // Extends SQLSchemaManager.java - class for reading, creating and upgrading the database schema: [[ PostgreSQL_Adapter-nexj/Upgrade | main.upgrade ]]: test- [[ PostgreSQL_Adapter-nexj/SchemaMangerTest | PostgreSQLSchemaManagerTest.java]] // Extends SQLSchemaManagerTest.java: Script - postgresql_drop.sql

* <u><code> DROP TABLE </code></u>

* <u><code> INSERT INTO TABLE </code></u>

* <u><code> ALTER TABLE </code></u>