hgweb: added revision date to annotate line data

The only revision information yielded by the annotate view was the revision
number itself. The patch allows the use of per-line revision dates in the
corresponding templates.

mercurial/hgweb/webcommands.py

@@ -550,7 +550,8 b' def annotate(web, req, tmpl):'
                    "targetline": targetline,
                    "line": l,
                    "lineid": "l%d" % (lineno + 1),
-                   "linenumber": "% 6d" % (lineno + 1)}
+                   "linenumber": "% 6d" % (lineno + 1),
+                   "revdate": f.date()}
 
     return tmpl("fileannotate",
                 file=f,