Improved wiki layout for sidebar and version sections

* Added new helper function format_datetime_timespec

public/stylesheets/sass/main.sass

@@ -503,6 +503,8 @@ ul.autocomplete
     padding-top: 10px
     border-bottom:
       :style solid
+  .column_content
+    margin-bottom: 0
 
 #wiki_content
   min-height: 400px
@@ -553,14 +555,25 @@ a.new_wiki_link
     :text-decoration = underline
 #sidebar
   float: right
-  width: 20%
+  width: 290px
+  margin-top: -60px
   #page-versions
-    margin-top: -60px
+    margin-bottom: 18px
     text-align: right
   #subpages
-    margin-top: 2em
+    border: 1px solid #78b74e
+    margin-top: 10px
+    padding: 0 0 0 0
+  #versions
+    margin-top: 10px
+    border: 1px solid #78b74e
 
 #wiki-syntax-help
   float: right
   table
     border-color: #78b74e
+
+.wiki_version
+  #sidebar
+    margin-top: -23px
+    border: 1px solid #78b74e