[SyncEvolution] EDS backend: Support for the new EBookClient API in EDS 3.2

Hi, Please find attached a patch for SyncEvolution bringing support for the new EBookClient API present in EDS 3.2. *** Support for the new EBookClient API in EDS 3.2 SyncEvolution EDS backend currently uses the EBook API which is deprecated as of EDS v3.2 and replaced by the new EBookClient API. This patch brings support for this new EBookClient API (when EDS 3.2 is detected at compile time). The new code based on the EBookClient API enables a few optimizations, especially the partial fetching of contacts to avoid useless DBus trafic. This results in better contact change tracking by fetching only the UID/REV attributes for each contact. Note: The new code uses the new GLibSupport header instead of the deprecated SmartPointer (eptr). *** Note that this patch only alters the contacts code (I think the calendar code should be handled in a separate patch). I also haven't optimized the EvolutionContactSource::isEmpty() yet and I'm planning to send another patch for this (the idea would be to use a view, ask only for the UIDs and stop the view as soon as we get a objectsAdded signal, this way we don't fetch the whole contacts and hopefully we don't even fetch all the UIDs, just the first burst). I'm awaiting review for this patch and for the EvolutionContactSource::isEmpty() change proposal before I move onto the next tasks. Kr, -- Dr. Christophe Dumez Linux Software Engineer Intel Finland Oy - Open Source Technology Center