[tracker] (7 commits) ...Merge branch 'wip/carlosg/refcount-in-code' into 'master'

[Sam Thursfield <sthursfield src gnome org>]

Summary of changes:

  dda0e80... libtracker-data: Drop "fts" argument from lowlevel database (*)
  fd9a62d... libtracker-data: Drop "date_time" argument from lowlevel da (*)
  e2f65f3... libtracker-data: Propagate TrackerResource deletes to subpr (*)
  c8bc4ee... libtracker-data: Reduce internal database change buffer siz (*)
  4c2246c... libtracker-data: Do not implicitly delete rdf:type relation (*)
  2dfd2ec... libtracker-data: Manage resource refcount in DB via code (*)
  8a4719b... Merge branch 'wip/carlosg/refcount-in-code' into 'master'

(*) This commit already existed in another branch; no separate mail sent