[tracker] (24 commits) Created branch wip/carlosg/anonymous-nodes

[Carlos Garnacho <carlosg src gnome org>]

The branch 'wip/carlosg/anonymous-nodes' was created.

Summary of new commits:

  a98d94e... libtracker-data: Minor refactor
  9c29cc6... libtracker-data: Drop unused argument in function
  9b1b47d... libtracker-data: Drop unused argument from insert/delete ho
  63f0368... libtracker-data: Remove another argument from insert/delete
  80b2efa... libtracker-data: Remove dead code
  39982d0... libtracker-data: Avoid pointless queries on predicate IDs
  371ddb6... libtracker-data: Avoid querying unnecessary IDs for notific
  97220d9... libtracker-data: Use TrackerProperty for predicate in track
  764dea8... libtracker-data: Pass GValue as object instead of GBytes
  932e9aa... libtracker-data: Get resource URIs after failures
  12ef892... libtracker-data: Deal with resource IDs as int64
  3cb76b3... libtracker-data: Deal with triple subjects as int64 ROWIDs
  4e35396... libtracker-data: Return int64 when creating new blank node
  ebb9f01... libtracker-data: Add TrackerToken API to hold blank nodes
  8521838... libtracker-data: Handle blank node tokens in TrackerSparql
  87d3c44... libtracker-data: Use bnode tokens where blank nodes are req
  ef6929b... libtracker-data: Insert TrackerResource URN early before in
  f596b6d... libtracker-data: Improve handling of boolean values
  b63cb4b... libtracker-data: Fix condition where blank_node_map is not 
  9497965... libtracker-data: Refurbish version management
  4cf4bf6... libtracker-data: Do not store pre-generated URN for blank n
  43db4ff... libtracker-data: Implement anonymous blank nodes
  c154592... libtracker-sparql: Add enum value for anonymous bnodes
  1be7aa9... docs: Mention ANONYMOUS_BNODES flag in the docs