Refactored the structures that manage cflow's calls. Only one class for call will be used from now on. Cflow line parsing logic has been moved to a CflowLineParser class as opposed to where it was before: the CflowCall class which is no longer used.
Continuing refactor of Call classes. Gprof line parsing functionality moved to new GprofLineParser class and rest of GprofClass attributes and logic integrated to Call.
Continue refactor in Call classes. LineParser classes now inherit from a common class that implements common functionality.
Fixed bug on implementation of singleton pattern for LineParser classes. Now every derived class has its own instance and get_instance method.
Changed algorithm for merging call graphs. Just adding all the edges and since there is just one Call class now, networkx can manage the duplicates.