Finished partitioning algorithm:

-  Added initial guess for the function order within a partition
-  Added option to calculate a pareto front for different number of partitions
-  Made some changes to improve the speed of the algorithm
-  Small bug fix for adding local convergers to the diagonal order in the MPG
-  Small bug fix in partition load imbalance factor
-  Code cleanup and updated docstrings


Former-commit-id: 2b240860df45a24b37f449442d1103ed3414f605