- put common code from select/getNextFeature and getFeatureById methods 
  to new declareCursor and getFeature methods
- unify type handling and support bool, arrays and time types
  (fixes #1009)
- ignore columns not explicitly supported (might apply to columns
  previously supported implicitly; please file a bug if you run into
  one)
- fixes a unreported problem with getFeatureById returning only NULL
  attributes.

Please test!


git-svn-id: http://svn.osgeo.org/qgis/trunk/qgis@8285 c8812cc2-4d05-0410-92ff-de0c093fc19c