modification allowing output the graph informations from the cython code 
   The code is not very efficient now and it is kind of ugly. It can use more refactoring once the algorithm for phasing is solved.
   Track Bug #21512

[git-p4: depot-paths = "//depot/software/bioinformatics/tools/pbdagcon/": change = 121712]
Merge remote-tracking branch 'p4/master'

modification allowing output the graph informations from the cython code
The code is not very efficient now and it is kind of ugly. It can use more refactoring once the algorithm for phasing is solved.