gitweb: use monospace font for commit messages

Commit messages often contain vertically aligned text. The default
paper style already uses monospace fonts for rendering commit messages.
And, AFAICT, a number of Git servers also render commit messages
with monospace. It seems like the reasonable thing to do.

This commit converts all instances of the full commit message
in the gitweb style to render with monospace.

mercurial/templates/gitweb/changelogentry.tmpl

@@ -7,7 +7,7 b''
 </div>
 <i>{author|obfuscate} [{date|rfc822date}] rev {rev}</i><br/>
 </div>
-<div class="log_body">
+<div class="log_body description">
 {desc|strip|escape|websub|addbreaks|nonempty}
 <br/>
 <br/>

mercurial/templates/gitweb/changeset.tmpl

@@ -43,7 +43,7 b' changeset |'
 {child%changesetchild}
 </table></div>
 
-<div class="page_body">
+<div class="page_body description">
 {desc|strip|escape|websub|addbreaks|nonempty}
 </div>
 <div class="list_head"></div>

mercurial/templates/gitweb/fileannotate.tmpl

@@ -59,7 +59,7 b' annotate |'
 </table>
 </div>
 
-<div class="page_path">
+<div class="page_path description">
 {desc|strip|escape|websub|addbreaks|nonempty}
 </div>
 <div class="page_body">

mercurial/templates/gitweb/filerevision.tmpl

@@ -59,7 +59,7 b' file |'
 </table>
 </div>
 
-<div class="page_path">
+<div class="page_path description">
 {desc|strip|escape|websub|addbreaks|nonempty}
 </div>
 

mercurial/templates/static/style-gitweb.css

@@ -145,6 +145,10 b' pre.sourcelines.stripes > span:target {'
 	background-color: #bfdfff;
 }
 
+.description {
+    font-family: monospace;
+}
+
 /* Graph */
 div#wrapper {
 	position: relative;

tests/test-hgweb.t

@@ -337,7 +337,7 b' static file'
 
   $ get-with-headers.py --twice localhost:$HGPORT 'static/style-gitweb.css' - date etag server
   200 Script output follows
-  content-length: 6986
+  content-length: 7032
   content-type: text/css
   
   body { font-family: sans-serif; font-size: 12px; border:solid #d9d8d1; border-width:1px; margin:10px; background: white; color: black; }
@@ -487,6 +487,10 b' static file'
   	background-color: #bfdfff;
   }
   
+  .description {
+      font-family: monospace;
+  }
+  
   /* Graph */
   div#wrapper {
   	position: relative;