Amend tag info page, change logging.

* Amend representation of the tag info page
* Change logging library, add "-log-level" argument and put most of the logging into DEBUG mode

templates/tag_info.html

@@ -11,36 +11,45 @@
     <li><a href="{{ basePath }}/{{ namespace }}/{{ repo }}">{{ repo|url_decode }}</a></li>
     <li class="active">{{ tag }}</li>
 </ol>
+
+<h4>Image Details</h4>
 <table class="table table-striped table-bordered">
     <thead bgcolor="#ddd">
         <tr>
-            <th colspan="2">Image Details</th>
+            <th colspan="2">Summary</th>
         </tr>
     </thead>
     <tr>
-        <td width="20%">Image</td><td>{{ registryHost }}/{{ repoPath }}:{{ tag }}</td>
+        <td width="20%"><b>Image URL</b></td><td>{{ registryHost }}/{{ repoPath }}{{if isDigest}}@{{else}}:{{end}}{{ tag }}</td>
     </tr>
-    {{if not isListOnly}}
     <tr>
-        <td>sha256</td><td>{{ sha256 }}</td>
+        <td><b>Digest</b></td><td>sha256:{{ sha256 }}</td>
     </tr>
     {{if not isDigest}}
     <tr>
-        <td>Created On</td><td>{{ created|pretty_time }}</td>
+        <td><b>Created On</b></td><td>{{ created|pretty_time }}</td>
+    </tr>
+    {{end}}
+    {{if not digestList}}
+    <tr>
+        <td><b>Image Size</b></td><td>{{ imageSize|pretty_size }}</td>
+    </tr>
+    <tr>
+        <td><b>Layer Count</b></td><td>{{ layersCount }}</td>
     </tr>
     {{end}}
     <tr>
-        <td>Image Size</td><td>{{ imageSize|pretty_size }}</td>
+        <td><b>Manifest Formats</b></td>
+        <td>{{if not isDigest}}Manifest v2 schema 1{{else}}<font color="#c2c2c2">Manifest v2 schema 1</font>{{end}} |
+            {{if not digestList && layersV2}}Manifest v2 schema 2{{else}}<font color="#c2c2c2">Manifest v2 schema 2</font>{{end}} |
+            {{if digestList}}Manifest List v2 schema 2{{else}}<font color="#c2c2c2">Manifest List v2 schema 2</font>{{end}}
+        </td>
     </tr>
-    <tr>
-        <td>Layer Count</td><td>{{ layersCount }}</td>
-    </tr>
-    {{end}}
 </table>
 
-{{if digests}}
-<h4>Manifest List v2</h4>
-{{range index, manifest := digests}}
+{{if digestList}}
+<h4>Multi-arch Sub-images <!-- Manifest List v2 schema 2 --></h4>
+{{range index, manifest := digestList}}
 <table class="table table-striped table-bordered">
     <thead bgcolor="#ddd">
         <tr>
@@ -60,11 +69,7 @@
         {{else if key == "size"}}
         <td>{{ manifest[key]|pretty_size }}</td>
         {{else if key == "digest"}}
-        {{if not isListOnly}}
-        <td><a href='{{ basePath }}/{{ namespace }}/{{ repo }}/{{ manifest["digest"] }}'>{{ manifest["digest"] }}</a></td>
-        {{else}}
-        <td>{{ manifest["digest"] }}</td>
-        {{end}}
+        <td><a href="{{ basePath }}/{{ namespace }}/{{ repo }}/{{ manifest["digest"] }}">{{ manifest["digest"] }}</a></td>
         {{else}}
         <td>{{ manifest[key] }}</td>
         {{end}}
@@ -73,7 +78,7 @@
 </table>
 {{end}}
 {{else if layersV2}}
-<h4>Manifest v2</h4>
+<h4>Blobs <!-- Manifest v2 schema 2--></h4>
 <table class="table table-striped table-bordered">
     <thead bgcolor="#ddd">
         <tr>
@@ -92,8 +97,8 @@
 </table>
 {{end}}
 
-{{if not isListOnly && not isDigest}}
-<h4>Manifest v1</h4>
+{{if not isDigest}}
+<h4>Image History <!-- Manifest v2 schema 1--></h4>
 {{range index, layer := layersV1}}
 <table class="table table-striped table-bordered">
     <thead bgcolor="#ddd">