Fixed persistency layer.

Now we have ODBC .. that accepts various connection string (including SQLite, MySQL,...)
  And EiffelStore+MySQL.
Updated sql scripts to work with MySQL, and SQLite.
Added a sql_statement (s: STRING): STRING that converts ROC sql statement to fit the underlying database engine.
 mostly to adapt incompatibilities such as AUTO_INCREMENT for MySQL and AUTOINCREMENT for SQLite
 by default SQL script should be written following MySQL SQL syntax.
Warning: to use ODBC persistence driver, it has to be installed on the target machine.

src/persistence/sql/cms_proxy_storage_sql.e

@@ -109,4 +109,12 @@ feature -- Access
 			Result:= sql_storage.sql_item (a_index)
 		end
 
+feature -- Conversion
+
+	sql_statement (a_statement: STRING): STRING
+			-- <Precursor>
+		do
+			Result := sql_storage.sql_statement (a_statement)
+		end
+
 end