Add new IP address search page.

Add a new IP address search page at /ip_addresses. Replaces the old
search page at /moderator/ip_addrs.

On user profile pages, show the user's last known IP to mods. Also add
search links for finding other IPs or accounts associated with the user.

IP address search uses a big UNION ALL statement to merge IP addresses
across various tables into a single view. This makes searching easier,
but is known to timeout in certain cases.

Fixes #4207 (the new IP search page supports searching by subnet).

app/views/ip_addresses/_index.html.erb

@@ -0,0 +1,30 @@
+<table class="striped autofit">
+  <thead>
+    <tr>
+      <th>Source</th>
+      <th>ID</th>
+      <th>IP Address</th>
+      <th>User</th>
+      <th>Date</th>
+    </tr>
+  </thead>
+  <tbody>
+    <% @ip_addresses.each do |ip| %>
+      <tr>
+        <td><%= link_to ip.model_type.underscore.humanize, ip_addresses_path(search: { model_type: ip.model_type }) %></td>
+        <td><%= link_to "##{ip.model_id}", ip.model %></td>
+        <td>
+          <%= link_to ip.ip_addr, ip_addresses_path(search: { ip_addr: ip.ip_addr }) %>
+          <%= link_to "»", ip_addresses_path(search: { ip_addr: ip.ip_addr, group_by: "user" }) %>
+        </td>
+        <td>
+          <%= link_to_user ip.user %>
+          <%= link_to "»", ip_addresses_path(search: { user_id: ip.user_id, group_by: "ip_addr" }) %>
+        </td>
+        <td><%= time_ago_in_words_tagged ip.created_at %></td>
+      </tr>
+    <% end %>
+  </tbody>
+</table>
+
+<%= numbered_paginator(@ip_addresses) %>

app/views/ip_addresses/_index_by_ip_addr.html.erb

@@ -0,0 +1,19 @@
+<table class="striped autofit">
+  <thead>
+    <tr>
+      <th>IP Address</th>
+      <th>Uses</th>
+    </tr>
+  </thead>
+  <tbody>
+    <% @ip_addresses.each do |ip| %>
+      <tr>
+        <td>
+          <%= link_to ip.ip_addr, ip_addresses_path(search: { ip_addr: ip.ip_addr }) %>
+          <%= link_to "»", ip_addresses_path(search: { ip_addr: ip.ip_addr, group_by: "user" }) %>
+        </td>
+        <td><%= link_to ip.count_all, ip_addresses_path(search: { ip_addr: ip.ip_addr }) %></td>
+      </tr>
+    <% end %>
+  </tbody>
+</table>

app/views/ip_addresses/_index_by_user.html.erb

@@ -0,0 +1,19 @@
+<table class="striped autofit">
+  <thead>
+    <tr>
+      <th>User</th>
+      <th>Uses</th>
+    </tr>
+  </thead>
+  <tbody>
+    <% @ip_addresses.each do |ip| %>
+      <tr>
+        <td>
+          <%= link_to_user ip.user %>
+          <%= link_to "»", ip_addresses_path(search: { user_id: ip.user_id, group_by: "ip_addr" }) %>
+        </td>
+        <td><%= link_to ip.count_all, ip_addresses_path(search: { user_id: ip.user_id, ip_addr: params[:search][:ip_addr] }) %></td>
+      </tr>
+    <% end %>
+  </tbody>
+</table>

app/views/ip_addresses/index.html.erb

@@ -0,0 +1,21 @@
+<div id="c-ip-addresses">
+  <div id="a-index">
+    <%= search_form_for(ip_addresses_path) do |f| %>
+      <%= f.input :user_id, label: "User ID", input_html: { value: params[:search][:user_id] }, hint: "Separate with spaces" %>
+      <%= f.input :user_name, label: "User Name", input_html: { "data-autocomplete": "user", value: params[:search][:user_name] }, hint: "Use * for wildcard" %>
+      <%= f.input :ip_addr, label: "IP Address", input_html: { value: params[:search][:ip_addr] } %>
+      <%= f.input :created_at, label: "Date", input_html: { value: params[:search][:created_at] } %>
+      <%= f.input :model_type, label: "Source", collection: IpAddress.model_types, include_blank: true, selected: params[:search][:model_type] %>
+      <%= f.input :group_by, label: "Group By", collection: [["User", "user"], ["IP Address", "ip_addr"]], include_blank: true, selected: params[:search][:group_by] %>
+      <%= f.submit "Search" %>
+    <% end %>
+
+    <% if params[:search][:group_by] == "user" %>
+      <%= render "index_by_user" %>
+    <% elsif params[:search][:group_by] == "ip_addr" %>
+      <%= render "index_by_ip_addr" %>
+    <% elsif @ip_addresses.present? %>
+      <%= render "index" %>
+    <% end %>
+  </div>
+</div>

app/views/users/_statistics.html.erb

@@ -10,6 +10,16 @@
         <th>Join Date</th>
         <td><%= presenter.join_date %></td>
       </tr>
+      <% if CurrentUser.is_moderator? %>
+        <tr>
+          <th>Last IP</th>
+          <td>
+            <%= link_to user.last_ip_addr, ip_addresses_path(search: { ip_addr: user.last_ip_addr }) %>
+            (<%= link_to "users", ip_addresses_path(search: { ip_addr: user.last_ip_addr, group_by: "user" }) %>,
+            <%= link_to "IPs", ip_addresses_path(search: { user_id: user.id, group_by: "ip_addr" }) %>)
+          </td>
+        </tr>
+      <% end %>
 
       <tr>
         <th>Inviter</th>