Fix copy constructor & assignment operator warning in FairMQChannel

Fix Weffc++ warnings

  - Add missing copy constructors and assignment operators .
  - Hide the warning from FairMQStateMachine.h where it is produced by boost and/or is intended.
  - Some code cleanup.

fairmq/devices/GenericSampler.tpl

@@ -13,6 +13,7 @@ base_GenericSampler<T,U,K,L>::base_GenericSampler()
   , fEventRate(1)
   , fEventCounter(0)
   , fContinuous(false)
+  , fTaskList()
 {
 }