Added -v, -g and -d. graphviz with frac_calculation refactor wip.
Small change, still wip
No real need to shorten the module name
More significant refactoring and changes. Initialise locale on startup.
Disabled gephi again because of the refactor, which fixes failing PEP8.
Updated most of the examples with the new API.
Broken WIP
Removed filter globs for timing and memory...

...because I couldn't work out how they worked.
Max-depth working.
defaultdict and max make things simple and easier to read
Merge branch 'feature/refactor-frac-calculation' into develop