A crash fix

Fixed a crash occurring in a scenario when during the execution, a community got empty and was deleted, and then another community was added.

New parameters to track progress

We added info_output_level parameter to allow users to see some information about current progress and intermediate_results_file_name parameter to save intermediate results. This could be particularly helpful for large networks, when calculation takes a lot of time.
We also allow start_separate parameter to be set from command line. This should help in cases when the network is small and quality of final partition is important.
Finally, we fixed a few bugs and compiler errors and warnings on windows.

Bugfix and start_separate option

Added start_separate option.

To start from a configuration where each node belongs to its own community

Combo refactored and with CPP support

This is the first significant update to the original Combo published in 2014.
We have refactored code and fixed a few bugs.
Two main features are reading input as matrix from .csv file and treat_as_modularity flag that allows to use Combo to solve clique partitioning problem.