hanging  because refinement criterion satisfied on one partition but not
another.
Fixed by including appropriate MPI collect in setEstMax() and setEstSum()
methods. So satisfaction of criterion is global not local.

added posibility to use est_t_max for time adaptivity. The time error may now be defined as est_t_combined =sum_fac*est_t_sum + max_fac*est_t_max. Default is sum_fac=1 and max_fac=0. Thus, by default adaption is working as before. 

included new variable <lastProcessedTimestep> in AdaptInfo, in order to have the timestep which lead to current time in user program

AdaptInfo: test-cout added (could be deleted)
ConditionalEstimator: should run over all elements, but there's an error (adapts only one times)

* Faster serialization of all objects

* AdaptInfo::reset() does not set timestep to 0.0, instead it reads the parameter from init file again
* ParaReal-stuff changed

* Added ParaReal files

* New function: double AdaptInfo::getEstTSum(int index)
* New flag for problem initialization: INIT_GLOBAL_REFINES (is also set to INIT_ALL)