Bug 153896 Improve the performance of BIRT datetime-converting
The current datetime converting algorithm in birt.core, xml&flatfile ODA implementations are not efficient enough.This is because we use java's SimpleDateTimeFormatter to parse ISO8601 compatible date/time values. We should write our own datatime string parser for ISO8601 datetime format.
core/org.eclipse.birt.core/src/org/eclipse/birt/core/data/DataTypeUtil.java
if ( source == null )
			return null;
		if ( source instanceof Blob )
			return (Blob) source;
		else
			throw new BirtException( pluginId,
					ResourceConstants.CONVERT_FAILS,
					new Object[]{
							source.toString( ), "Blob"
					},
					resourceBundle );
	}
	/**
	 * @param source
	 * @return byte array
	 * @throws BirtException
	 */
	public static byte[] toBytes( Object source ) throws BirtException
	{
		
		if ( source == null )
			return null;
		if ( source instanceof byte[] )
			return (byte[]) source;
		else
			throw new BirtException( pluginId,
					ResourceConstants.CONVERT_FAILS,
					new Object[]{
							source.toString( ), "Binary"