Soprano - the Qt/C++ RDF framework

Soprano 2.2.2 is a maintenance release which mostly improves the build system which should make things easier for packagers.

• Properly clear the error in the SparqlModel
• Made all D-Bus dependant parts optional for successful compilation on Windows.
• Redland include dir fix.
• New cmake options to manually disable all optional components:
  • Redland backend
  • Sesame2 backend
  • Raptor parser/serializer
  • CLucene full text index
  • D-Bus integration
  • Apidox generation
• Less use of dynamic_cast