Adds to Melange a tags framework based on taggable-mixin.
The taggable-mixin allowed only tag per Datastore model. This is extended
framework allows any arbitrary number of tags per Datastore model. Also,
now one can define different models for different Tag types which are all
inherited from the base Tag model provided by taggable-mixin.
The GHOPTask model makes use of 2 tags per model, one for difficulty and the
other for task_type, both using the tags framework.
Reviewed by: Paweł Sołyga
<!-- Copyright 2007 Google Inc. All Rights Reserved -->
<!--
The below HTML code was generated and appended by Google. It's purpose is
to display a logging console in the browser. It's appearing here because
either:
(a) the CGI parameter "debug" was in the URL
(b) the cookie "_ah_severity" was present in the HTTP request
To stop this from being appended, you should remove the CGI parameter
"debug" from the request URL and then either click the "Close" link on the
logging console, or delete the "_ah_severity" cookie.
All element ids used by the code for this logging console are prefixed
with "_ah", all cookies used are prefixed with "_ah", and all classes and
functions are in the namespace "AH".
-->
<div id="_ah_base"
style="z-index: 99999; position: absolute; right: 10px;
background-color: white; color: black; width: 600px;
border: 1px solid black; padding: 10px; font-family: courier;
font-size: medium; margin: 10px;">
<table><tr><td>
<table cellspacing=0 cellpadding=0 rules=all border=frame>
<tr>
<td style="background-color: white; cursor: pointer; height: 15px;
width: 15px;"
id="_ah_up_left"
onClick="(new AH.LoggingConsole).moveBaseDiv('up_left')"></td>
<td style="background-color: white; cursor: pointer; height: 15px;
width: 15px;"
id="_ah_up_right"
onClick="(new AH.LoggingConsole).moveBaseDiv('up_right')"></td>
</tr>
<tr>
<td style="background-color: white; cursor: pointer; height: 15px;
width: 15px;"
id="_ah_down_left"
onClick="(new AH.LoggingConsole).moveBaseDiv('down_left')"></td>
<td style="background-color: white; cursor: pointer; height: 15px;
width: 15px;"
id="_ah_down_right"
onClick="(new AH.LoggingConsole).moveBaseDiv('down_right')"></td>
</tr>
</table>
</td><td valign=top>
<a id="_ah_show_debug"
href="javascript:(new AH.LoggingConsole).changeLogSeverity('debug')">
DEBUG</a>
<a id="_ah_show_info"
href="javascript:(new AH.LoggingConsole).changeLogSeverity('info')">
INFO</a>
<a id="_ah_show_warning"
href="javascript:(new AH.LoggingConsole).changeLogSeverity('warning')">
WARNING</a>
<a id="_ah_show_error"
href="javascript:(new AH.LoggingConsole).changeLogSeverity('error')">
ERROR</a>
<a id="_ah_show_critical"
href="javascript:(new AH.LoggingConsole).changeLogSeverity('critical')">
CRITICAL</a>
<a id="_ah_close"
href="javascript:(new AH.LoggingConsole).closeEverything()">Close</a>
</td></tr></table>
<div id="_ah_loglines" style="margin: 10px; height: 300px; overflow: auto;">