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

[Sam Thursfield <sthursfield src gnome org>]

Summary of changes:

  2f0fdcc... libtracker-data: Use function to pretty print a IRI (*)
  4a8d6c0... libtracker-data: Use md5 to uniquify graph in-memory databa (*)
  20abf9b... libtracker-data: Fix possible critical in error paths (*)
  af97ced... libtracker-data: Rebuild TrackerSparql SQL string on graph  (*)
  74357e4... libtracker-data: Store stmt for SparqlBNODE() function (*)
  926e34a... libtracker-data: Check further the DBus name in SERVICE uri (*)
  bbae610... libtracker-sparql: Handle TrackerEndpointDBus cursor writes (*)
  bf81af0... tests: Add test for UNION of local and remote URNs (*)
  2064d9c... Merge branch 'wip/carlosg/service-fixes' into 'master'

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