[tracker] (8 commits) ...Merge branch 'wip/carlosg/grilo-fixes' into 'master'

[Sam Thursfield <sthursfield src gnome org>]

Summary of changes:

  87ab73e... libtracker-data: Accept statement bindings in limit/offset (*)
  463e2db... libtracker-data: Don't add select variable unless on topmos (*)
  b868d51... libtracker-data: Improve error message of BIND() variable e (*)
  96c7cb1... libtracker-data: Propagate remote error messages through th (*)
  12abe96... libtracker-data: Ensure subselects propagate the SelectClau (*)
  7297788... tests: Add tests for binding arguments in limit/offset (*)
  27b9ada... tests: Add tests for UNION of subselects with different var (*)
  6885274... Merge branch 'wip/carlosg/grilo-fixes' into 'master'

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