[tracker] (9 commits) ...Merge branch 'wip/carlosg/wal-and-other-fixes' into 'master'

[Sam Thursfield <sthursfield src gnome org>]

Summary of changes:

  b418cb1... libtracker-sparql: Handle notifier query cursor in a thread (*)
  6eb94ea... libtracker-data: Return correct type (*)
  bc877e5... libtracker-data: Fix possible invalid write (*)
  571c9a5... libtracker-sparql: Use matching integer types on (de)serial (*)
  24843bd... libtracker-sparql: Also close endpoint cursors in the dispa (*)
  20b391c... libtracker-data: Drop our WAL hook (*)
  9e084ca... libtracker-data: Set page_size first and foremost (*)
  f3bb1b1... libtracker-data: Create graph databases with a separate int (*)
  a7acae4... Merge branch 'wip/carlosg/wal-and-other-fixes' into 'master

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