Added canonical link elements to all pages; new variable 'page.sitehost'

_config.yml

@@ -49,3 +49,4 @@ defaults:
       path: ""   # everywhere
     values:
       bxemail: '<boxes(at)thomasjensen.com>'
+      sitehost: 'boxes.thomasjensen.com'

_includes/header.html

@@ -12,8 +12,12 @@
     <meta name="author" content="Thomas Jensen" />
     <meta name="robots" content="index,follow" />
 	{% if page.sedesc %}
+	<!-- start page -->
 	<meta name="description" content="{{ page.sedesc }}" />
     <meta name="keywords" content="software, ascii, ascii art, filter, command line, box, boxes, box drawing" />
+	<link rel="canonical" href="http://{{ page.sitehost }}/" />
+	{% else %}
+	<link rel="canonical" href="http://{{ page.sitehost }}{{ page.url }}" />
 	{% endif %}
     <script type="text/javascript">
         if (window.location.hostname == "ascii-boxes.github.io") {
@@ -25,7 +29,7 @@
 			else if (targetPath.indexOf(prjNamePrefix + "/") == 0) {
 			    targetPath = targetPath.substring(prjNamePrefix.length);
             }
-            window.location = window.location.protocol + "//boxes.thomasjensen.com"
+            window.location = window.location.protocol + "//{{ page.sitehost }}"
                     + targetPath + window.location.hash;
         }
     </script>

docs/boxes-man-1.html

@@ -429,7 +429,7 @@ self-explanatory, though.
 <I>Boxes</I>
 
 is available from its website at
-<A HREF="http://boxes.thomasjensen.com/">http://boxes.thomasjensen.com/</A>.
+<A HREF="http://{{ page.sitehost }}/">http://{{ page.sitehost }}/</A>.
 The website also features a number
 of examples illustrating this manual page as well as more in-depth
 documentation.