[Futurev4] fix failing tests

• Test 1: GaussSys.gausssys Here, I had to change the test so that it accepts the minimum working configuration coming from Gaussino.
• Test 2: LoKiGen.jira_461 ROOTIO from HepMC3 caused namespace collision with HepMC. It'll be now commented out in Gaussino as there is no need for it yet.
• Test 3: LoKiGen.lokigen0 Same problem as above + it looks like LoKi has some problems with dereferencing HepMC.GenParticle(). For example, this GP(HepMC.GenParticle()) gives

static double LoKi::Dicts::FunCalls<HepMC3::GenParticle>::__call__(LoKi::Functor<shared_ptr<const HepMC3::GenParticle>,double>& fun, const shared_ptr<const HepMC3::GenParticle>& o) =>
    could not convert argument 2

• Test 4: GaussTracker.shortened_sensdet_name This test, in its current shape, won't work because the expected debug debug() << "Sens det shortened name " << name() << " -> " << detname << endmsg; has been moved to the construct() in GiGaMTG4SensDetFactory. I wonder, in fact, whether this test is going to be useful... update: This is a very specific configuration in order to trigger a debug message with a shortened name of the sensitive detector. In order to do so, in Gauss-on-Gaussino it will only be triggered by running construct() on the GiGaSensDetTracker.

needs Gaussino/Gaussino!18 (merged) @gcorti @dmuller

Phys/LoKiGen/LoKi/GenParticleCuts.h

@@ -253,7 +253,7 @@ namespace LoKi
      *  GCut cut = ... ;
      *
      *  // Create the monitored predicate using the generic counter
-     *  // either local counter, or the counter from IStatSvc or ICounterSvc
+     *  // either local counter, or the counter from IStatSvc
      *  StatEntity* counter = ... ; ///< the generic counter
      *  GCut mon = COUNTER ( cut , counter ) ;
      *
@@ -1001,7 +1001,7 @@ namespace LoKi
      *  GFun fun = ... ;
      *
      *  // Create the monitored function using the generic counter
-     *  // either local counter, or the counter from IStatSvc or ICounterSvc
+     *  // either local counter, or the counter from IStatSvc
      *  StatEntity* counter = ... ; ///< the generic counter
      *  GFun mon = STAT ( fun , counter ) ;
      *