[tracker] (7 commits) ...Merge branch 'wip/carlosg/datetime-comparisons' into 'master'

[Carlos Garnacho <carlosg src gnome org>]

Summary of changes:

  817e0af... libtracker-data: Handle xsd:date along xsd:dateTime in cond (*)
  5e0c448... libtracker-data: Minor refactor (*)
  3ea5f9e... libtracker-data: Handle relational expressions with arbitra (*)
  3d2c16c... tests: Add tests for xsd:dateTime comparisons in FILTER (*)
  c637ae3... libtracker-data: Allow ^^ casts on parameters (*)
  6c80a63... tests: add test for binding a string to a xsd:dateTime via  (*)
  d765b07... Merge branch 'wip/carlosg/datetime-comparisons' into 'maste

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