[tracker] (8 commits) Created branch wal

[Jürg Billeter <juergbi src gnome org>]

The branch 'wal' was created.

Summary of new commits:

  ad5c945... libtracker-db: Enable Write-Ahead Logging in SQLite
  9fccd0c... libtracker-data: Do not use overly large transactions anymo
  0ede008... tracker-store: Drop special batch handling
  8c27fad... tracker-store: Allow running queries while update is runnin
  17bba78... libtracker-db: Disable shared cache, required for parallel 
  c010d99... tracker-store: Store sender for turtle import tasks as well
  6b96ea4... tracker-store: Never try to process more than 1 million eve
  e02fb1c... tracker-store: Turtle import improvements