Minor improvements to profiling

First patch has two minor improvements:

Make it possible to switch on profiling via site/vXXX+/controlDict (I like to always have profiling)
For multi-region cases add the region-name to the name of the profiling-information

The second patch adds profiling to the time loop by deleting/creating a new profiling::Trigger-object at every call to run(). That way in the profiling information it can now be seen how much time was spent inside and outside the time-loop (usually should be in the order of 99% to 1). The ProfilingTrigger-class was necessary as apparently C++ does not allow the forward-declaration of interior classes like profiling::Trigger

profilingProfileTimeLoop.patch

I split this into two patches because obviously fiddling with the Time-class is always controverial