[dev] DataTree_sql_flat

[Duck]

This is the first try to extend DataTree attributes to allow splitting 
group_uid specific attributes in a dedicated flat tables.

Attached Files: 
- Forums.diff 	tells to DT to use a flat table
- Messages.diff 	tells to DT to use a flat table
- agora.sql 	flat attributes tables for agora forums and messages
- attributes2flat.php	transfers data from normal DT to specific flat table
- conf.diff	add an boolean DT config option -> support flat tables or not
- sql_flat.php	 	and finally the DataTree_sql_flat class file

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CREATE TABLE `agora_datatree_attributes_forums` (
    `datatree_id` int(10) unsigned NOT NULL,
    `message_seq` int(10) NOT NULL,
    `forum_description` varchar(255) NOT NULL,
    `forum_moderated` varchar(255) NOT NULL,
    `forum_attachments` varchar(255) NOT NULL,
    PRIMARY KEY  (`datatree_id`)
);

CREATE TABLE `agora_datatree_attributes_messages` (
    `datatree_id` int(10) unsigned NOT NULL,
    `message_seq` int(10) NOT NULL,
    `message_forum_id` int(10) NOT NULL,
    `message_subject` varchar(255) NOT NULL,
    `message_body` varchar(255) NOT NULL,
    `message_author` varchar(255) NOT NULL,
    `message_timestamp` int(10) NOT NULL,
    `message_messag_attachment` varchar(255) NOT NULL,
    `message_message_seq` int(10) NOT NULL,
    `message_last_message` varchar(255) default NULL,
    `message_last_timestamp` int(10) default NULL,
    `message_last_author` varchar(255) default NULL,
    `message_moderate` int(10) NOT NULL,
    PRIMARY KEY  (`datatree_id`)
);
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