Fix untested StatusCodes exposed by gaudi/Gaudi!386

In addition some flyby modernisations:

• Remove some empty destructors
• Remove some empty initialize/finalize methods
• Fix two initialize methods that were not calling the correct base class initialize (were calling GaudiAlgorithm::initialize instead of VeloTELL1Algorithm::initialize, GaudiTupleAlg::initialize respectively)
• Remove an obsolete Gaudi include
• Suppress compilation warnings from Boost, ROOT, CLHEP, XercesC