Adding DDL dir on RelationalStorage branch.

src/ZODB/DDL/InterbaseStorage.sql

+/* Replace the CREATE DATABASE path argument with
+the path and file you want to use for your
+InterbaseStorage
+
+$Id: InterbaseStorage.sql,v 1.1 2000/05/27 08:09:58 chrism Exp $
+*/
+
+CREATE DATABASE '/home/chrism/zope_storage2.gdb';
+
+create table zodb_data (
+	z_oid		char(12) not null,
+	z_serial	char(12) not null,
+	z_prev		char(12),
+	z_status	char(1),
+	z_data		blob,
+	z_datalen	integer,
+	z_dataserial	char(12),		
+	primary key (z_oid, z_serial)
+);
+ 
+create table zodb_trans (
+	z_serial	char(12) not null primary key,
+	z_status	char(1),
+	z_username	varchar(255),
+	z_description	varchar(255),
+	z_ext		varchar(255)
+);
+
+create table zodb_version (
+       	z_version	varchar(255),
+	z_oid		char(12) not null,
+	z_serial	char(12) not null,
+	z_status	char(1),
+	z_nvserial	char(12),
+	primary key (z_oid, z_serial)
+);