Patch to trac 0.12 to fix hyperlinks to dependent tickets

Found a duplicate (with reaction from coderanger!) in #7257.

I transformed your patch in something you might apply to dagvl's git-version 2.1.3-viz4:

diff --git a/mastertickets/model.py b/mastertickets/model.py
index e98d114..bab21c4 100644
--- a/mastertickets/model.py
+++ b/mastertickets/model.py
@@ -5,7 +5,7 @@ from datetime import datetime
 
 from trac.ticket.model import Ticket
 from trac.util.compat import set, sorted
-from trac.util.datefmt import utc, to_timestamp
+from trac.util.datefmt import utc, to_utimestamp
 
 class TicketLinks(object):
     """A model for the ticket links used MasterTickets."""
@@ -34,7 +34,7 @@ class TicketLinks(object):
         """Save new links."""
         if when is None:
             when = datetime.now(utc)
-        when_ts = to_timestamp(when)
+        when_ts = to_utimestamp(when)
         
         handle_commit = False
         if db is None:
diff --git a/mastertickets/web_ui.py b/mastertickets/web_ui.py
index b3288cb..13cf744 100644
--- a/mastertickets/web_ui.py
+++ b/mastertickets/web_ui.py
@@ -35,7 +35,7 @@ class MasterTicketsModule(Component):
     FIELD_XPATHS = {
         'query': 'table[@class="listing tickets"]/tbody/td[@class="%s"]/text()',
         'ticket_id': 'table[@class="listing tickets"]/tbody/td[@class="id"]/a/text()',
-        'ticket': 'div[@id="ticket"]/table[@class="properties"]/td[@headers="h_%s"]/text()',
+        'ticket': '//div[@id="ticket"]/table[@class="properties"]//td[@headers="h_%s"]/text()',
     }
     fields = set(['blocking', 'blockedby'])

Applied http://github.com/coderanger/trac-mastertickets/commit/2ecc52571c79fc150316643ba00243112fb78fdf