[tracker] (19 commits) Non-fast-forward update to branch wip/carlosg/serialize-api

[Carlos Garnacho <carlosg src gnome org>]

The branch 'wip/carlosg/serialize-api' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  82b1c5a... libtracker-data: Add query to tell whether a query may be s
  63751a3... libtracker-sparql: Implement serialize_async/finish in dire
  96db14d... libtracker-data: Use SQL value type as a last resort to det
  694458a... libtracker-sparql: Fix refcount management of a serializer'
  75de602... libtracker-data: Provide graph information at describe quer
  72f991d... libtracker-sparql: Support serialization to Trig format
  b8db889... libtracker-sparql: Implement serialize_async/finish on DBus
  6d88178... libtracker-sparql: Implement serialize_async/finish on remo
  ae89298... cli: Use serialize() method for "tracker3 export" command
  ae14938... libtracker-data: Hint best tracker_triples access strategy 
  977001f... libtracker-sparql: Add TrackerSparqlStatement API to serial
  e05008b... libtracker-sparql: Implement serialization on direct statem
  3f00fab... libtracker-sparql: Handle statement serialization in D-Bus 
  d55914d... libtracker-sparql: Implement statement serialization in D-B
  bd5254e... libtracker-sparql: Add missing "static" in functions
  360250d... libtracker-sparql: Implement statement serialization on rem
  edd1dc3... tests: Add serialize tests
  564311b... libtracker-sparql: Fix typo

Commits added to the branch:

  8787b9c... libtracker-data: Add internal API to tell whether a query m
  21d9232... libtracker-sparql: Implement serialize_async/finish in dire
  e8e0d17... libtracker-data: Use SQL value type as a last resort to det
  962b5c5... libtracker-sparql: Fix refcount management of a serializer'
  78b1c1d... libtracker-data: Provide graph information at describe quer
  f33c922... libtracker-sparql: Support serialization to Trig format
  843a9ee... libtracker-sparql: Implement serialize_async/finish on DBus
  ad4b2ee... libtracker-sparql: Implement serialize_async/finish on remo
  823fbd8... cli: Use serialize() method for "tracker3 export" command
  484deac... libtracker-data: Hint best tracker_triples access strategy 
  26e5bff... libtracker-sparql: Add TrackerSparqlStatement API to serial
  57e022f... libtracker-sparql: Implement serialization on direct statem
  8191387... libtracker-sparql: Handle statement serialization in D-Bus 
  d350c97... libtracker-sparql: Implement statement serialization in D-B
  bf2f075... libtracker-sparql: Add missing "static" in functions
  63b9dcd... libtracker-sparql: Implement statement serialization on rem
  a74a504... tests: Add serialize tests
  45e484c... libtracker-sparql: Fix typo
  485a00c... docs: Add documentation blurb about DESCRIBE resultset form