A new SimulatorTimer and the test code and test data

Sorry, I am still learning to propose pull request, while with this request, the request #545 seems to be covered. So I will close #545.  

The request covers 
the new SimulatorTimer class 
test code:   test_timer.cpp 
test data:   tests/TESTTIMER.DATA 

sim_fibo_ad example could not be compiled with this new SimulatorTimer class, since we deleted some members and member functions.