SetParName added, GetParName fixed

I still can't find a variable that isn't initialized correctly, maybe you will spot something if you find some time.
On 11 test in stressHistoFit we have a segfault. GDB and valgrind said that crash is made inside function FindObject used inside constructor of TF1 called by TF2. Aswell i can't figure out why. 
Sometimes short look of somebody who didn't wrote that code may solve problem, have a look please if you can.

Thanks.