When allocating a new event, if the same name is used, no allocation is
created and NULL is returned. We start trying to use the returned value
which seg-faulted. I added a check to only continue if the returned value
from the allocation is not NULL.
refs #149
Changed the way JITEvents are created and handled. Instead of taking a function pointer directly we save a name of a function to the JITEvent class. The class will dynamically look up a function that matches the name both during event creation and during checkpoint restart.
Fixes#53