traceback: allow providing a local support contact point The extensions blaming code is fine for casual users but pretty terrible for corporate environments that can deploy a large amount of extensions to unsuspecting users. Reports will likely blame a random "innocent" extension (in our case crecord) and the hint in the message will triggers endless debug attempts from the user. We introduce a "ui.supportcontact" option that allow such big company to redirect their users to their own support desk. This disables all extensions blaming and just point people to the local support in all cases.

--- a/mercurial/help/config.txt	Thu Sep 17 11:50:55 2015 -0700
+++ b/mercurial/help/config.txt	Fri Sep 11 12:45:19 2015 -0700
@@ -1511,6 +1511,11 @@
 ``style``
     Name of style to use for command output.
 
+``supportcontact``
+    Location pointed at in Mercurial traceback for reporting crash. Use this if
+    you are a large organisation with it's own Mercurial deployement process and
+    crash reports should be addressed to your internal support.
+
 ``timeout``
     The timeout used when a lock is held (in seconds), a negative value
     means no timeout. (default: 600)