Possible data loss with Tracker 1.3.x

[Bastien Nocera <hadess hadess net>]

Hey,

Tracker 1.3.2 and 1.3.3 had a bug that made them fail to start:
https://bugzilla.gnome.org/show_bug.cgi?id=743727

However, after 1.3.4 fixed that problem, we caught a bug in the 
database migration code added earlier that didn't get uncovered until 
now.

Please refrain from using Tracker 1.3 if previous installations had 
Tracker 1.2 or earlier installed, as it will corrupt the database 
beyond repair:
https://bugzilla.gnome.org/show_bug.cgi?id=745737

Cheers