hgweb: add absolute urls for archives in json-summary

mercurial/templates/json/map

@@ -114,7 +114,8 b" summary = '\\{"
 archiveentry = '\{
   "node": {node|json},
   "extension": {extension|json},
-  "type": {type|json}
+  "type": {type|json},
+  "url": {"{urlbase}{url}archive/{node}{extension}"|json}
   }'
 filediff = '\{
   "path": {file|json},

tests/test-hgweb-json.t

@@ -806,7 +806,8 b' summary/ shows a summary of repository s'
       {
         "extension": ".tar.bz2",
         "node": "tip",
-        "type": "bz2"
+        "type": "bz2",
+        "url": "http://*:$HGPORT/archive/tip.tar.bz2" (glob)
       }
     ],
     "bookmarks": [