bugfixes MafFlow/Graphcut

* Memoryleak in MeaxFlow Kolmogorov
* Finish implementation and test for MafFlow IBFS Wrapper

! To make IBFS run add the following lines to the end of ibfs.cpp !
! TODO : update Patch ! 

template class  IBFSGraph<int,int,int>;
template class  IBFSGraph<size_t,size_t,size_t>;
template class  IBFSGraph<short,int,int>;
template class  IBFSGraph<float,float,float>;
template class  IBFSGraph<double,double,double>;