class AliCodeTimer: public TObject

 Class to get organized with the way we're timing our methods...

 Typical usage is based on macros (like for AliLog related ones AliDebug...)

 The idea is to instrument the code with a few macro calls, and then,
 at the end of the execution, get a printout of *all* the timers, by using
 AliCodeTimer::Instance()->Print()
 instead of getting scattered outputs all over the place.

 To time a given method, use :

 void ClassA::MethodA(....)
 {
    AliCodeTimerAuto("")
 }

 To get several timers within a same method, use :

 void ClassA::MethodB(...)
 {
   AliCodeTimerStart("doing something")

   AliCodeTimerStop("doing something")

   AliCodeTimerStart("doing something else")

   AliCodeTimerStop("doing something else")
 }