[tracker] (12 commits) Created branch IorR-null-support

[Philip Van Hoof <pvanhoof src gnome org>]

The branch 'IorR-null-support' was created.

Summary of new commits:

  f7a370a... libtracker-data: Add internal API for deleting all objects
  12cfb48... libtracker-data: Support for insert or replace null objects
  bb49d75... libtracker-data: Add stops and error handling for unsupport
  68020d0... libtracker-data: Insert or replace's null support for multi
  c8bfd5a... libtracker-data: Add some code comments for clarification
  2308c4f... libtracker-data: Allow null upfront a new set for multivalu
  7a70d4b... tests: Add functional test for insert or replace null suppo
  aae3813... tests: Fix glitch in functional test
  ebf2af5... libtracker-data: Make null,x,null,y,z work
  55047fc... tests: Add functional test for multiple nulls use-case
  b03ee91... tests: Fix whitespace issues in new test
  d4fb5dd... libtracker-data: Cleanup of code after review