Add docs about current service class system, tiny util to make updates a

little easier than the standard config util

doc/service_classes.bb

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+[b]Service Classes[/b]
+
+Service classes allow you to set limits on system resources. A GUI to configure this is currently under development. 
+
+As a temporary measure, the following commandline utilities can be used:
+
+Usage:
+
+[code]util/service_class[/code]
+list service classes
+
+[code]util/config system default_service_class firstclass[/code]
+set the default service class to 'firstclass'
+
+[code]util/service_class firstclass[/code]
+list the services that are part of 'firstclass' service class
+
+[code]util/service_class firstclass photo_upload_limit 10000000[/code]
+set firstclass total photo disk usage to 10 million bytes
+
+[b]current limits[/b]
+photo_upload_limit - maximum total bytes for photos
+total_items - maximum total toplevel posts
+total_pages - maximum comanche pages
+total_identities - maximum number of channels owned by account
+total_channels - maximum number of connections
+total_feeds - maximum number of rss feed connections
+attach_upload_limit - maximum file upload storage (bytes)
+minimum_feedcheck_minutes - lowest setting allowed for polling rss feeds
+chatrooms - maximum chatrooms
+chatters_inroom - maximum chatters per room

util/service_class

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+#!/usr/bin/env php
+<?php
+
+// Temporary service class utility - see baseurl/help/service_classes
+
+require_once('include/cli_startup.php');
+
+cli_startup();
+
+if($argc > 3) {
+	$d = get_config('service_class', $argv[1]);
+	$d[$argv[2]] = $argv[3];
+	set_config('service_class', $argv[1], $d);
+	echo 'Updated service class "' . $argv[1] . '" service "' . $argv[2] . '" to ' . $argv[3] . "\n";
+}
+
+if($argc == 2) {
+	$d = get_config('service_class', $argv[1]);
+	echo $argv[1] . ":\n";
+	foreach($d as $k => $v) {
+		echo "$k = $v\n";
+	}
+}
+
+if($argc == 1) {
+	load_config('service_class');
+	foreach($a->config['service_class'] as $class=>$props) {
+		echo "$class:\n";
+		$d = unserialize($props);
+		foreach($d as $k => $v) {
+			echo "\t$k = $v\n";
+		}
+	}
+}