[tracker] Non-fast-forward update to branch wip/carlosg/test

[Carlos Garnacho <carlosg src gnome org>]

The branch 'wip/carlosg/test' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  d4f56b0... libtracker-data: Iterate through graphs directly in tracker
  7e7f2f3... libtracker-data: Handle union graph property/class queries 
  1c543f8... libtracker-data: Drop union graph views for properties/clas
  4c1603c... Revert "libtracker-data: Work around terrible query plannin
  7599424... libtracker-data: Make inline union of all Refcount tables

Commits added to the branch:

  6ae039e... libtracker-data: Implement FTS match queries with WITH subq