Add preliminary report system

The report system is pretty low-tech. However the scaffolding is there
for a lot of new stuff. What we currently have:

* Users can create reports
* Staff can view reports
* Admins can create report templates

There's a post drop-down menu available on all posts now, too. This is
where "report post" menu item lives and other things like that can be
added too.

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

board/templates/board/post_snippet.html

@@ -1,6 +1,6 @@
 {% load post_body %}
 {% load l10n %}
-<div id="p{{post.id}}">
+<div id="p{{post.id}}" data-report-url="{% url 'board:report_form' board.url post.id %}">
 {# Image #}
 {% if post.thumbnail %}
 {# Image info #}
@@ -19,7 +19,6 @@
 {% endif %}
 
 {# Post ID, username, time #}
-<div class="post_content">
 <a href="#p{{post.id}}">#.</a>
 <span class="post_id">{{post.id}}</span>
 {% if post.subject %}
@@ -32,8 +31,10 @@
 {% if reply_link %}
     [<a href="{{post.get_absolute_url}}">{% localize on %}Reply{% endlocalize %}</a>]
 {% endif %}
+<a href="#" class="post_menu_button" data-id="post_menu_button">▶</a>
 
 {# "X replies elided" dialog for OPs on the board #}
+<div class="post_content">
 {% if replies_elided > 0 %}
 <br/>
 <span class="replies_elided">

board/templates/board/report_form.html

@@ -0,0 +1,16 @@
+{% extends "board/base.html" %}
+{% load l10n %}
+{# Title #}
+{% block title %}{% localize on %}Reporting post {{post.id}}{% endlocalize %}{% endblock %}
+{# Body #}
+{% block content %}
+<div class="row">
+    <form method="post">
+        {% csrf_token %}
+        <table>
+        {{ form.as_table }}
+        <tr><td>&nbsp;</td><td><input type="submit" value="Submit"></td></tr>
+        </table>
+    </form>
+</div>
+{% endblock %}

board/templates/board/report_success.html

@@ -0,0 +1,29 @@
+{% extends "board/base.html" %}
+{% load l10n %}
+{# Title #}
+{% block title %}{% localize on %}Report success{% endlocalize %}{% endblock %}
+{# Body #}
+{% block content %}
+<div class="row" id="message">
+    {% localize on %}Post reported. This window will close in 1 second.{% endlocalize %}
+</div>
+
+<script>
+function isIframe() {
+    try {
+        return window.self !== window.top;
+    } catch (_) {
+        return true;
+    }
+}
+
+setTimeout(function() {
+    if(isIframe()) {
+        window.top.reportWindow.close();
+    } else {
+        window.close();
+    }
+}, 5000);
+
+</script>
+{% endblock %}