Move more logic to the helper modules

- Diff view changes
-- Only show pool description changes in diff view
-- Conditionally render diff link when applicable values are changed
-- Conditionally show diff view sections when values are changed
- Show renames on index view
-- There is plenty of space
-- This wasn't shown at all for wikis
-- Having to navigate to an alternate page is unwieldy for pools
- Show "posts" as a status on pools
-- This is so all changes among versions are quantified as a status
- Standardize diff/index titles

app/views/pool_versions/_listing.html.erb

@@ -2,14 +2,15 @@
 
     <%= table_for @pool_versions, {class: "striped autofit", width: "100%"} do |t| %>
       <% t.column column: "diff", width: "3%" do |pool_version| %>
-        <%= link_to_if pool_version.text_field_changed, "diff", diff_pool_version_path(pool_version.id) %>
+        <%= link_to_if pool_version_show_diff(pool_version), "diff", diff_pool_version_path(pool_version.id) %>
       <% end %>
-      <% t.column "Pool" do |pool_version| %>
+      <% t.column "Pool", td: {class: "diff-body"} do |pool_version| %>
         <%= link_to pool_version.pretty_name, pool_path(pool_version.pool_id), class: "pool-category-#{pool_version.pool.category}" %>
         <%= link_to "»", pool_versions_path(search: { pool_id: pool_version.pool_id }, anchor: "pool-version-#{pool_version.id}"), class: "pool-category-#{pool_version.pool.category}" %>
+        <%= pool_version_name_diff(pool_version) %>
       <% end %>
       <% t.column "Post Changes", td: { class: "col-expand" } do |pool_version| %>
-        <%= render "pool_versions/diff", diff: pool_version.build_diff  %>
+        <%= pool_version_post_diff(pool_version) %>
       <% end %>
       <% t.column "Post Count" do |pool_version| %>
         <%= link_to pool_version.post_ids.size, pool_versions_path(search: { pool_id: pool_version.pool_id }) %>