Improve readability of result output

[cabiad]

just printing the various dicts isn't exactly user-friendly ;)

[noahnu]

what about modifying the Stats methods to gather node information as well, mainly file/lineno for simple debugging.

@visit(nodes.FunctionDef)
def count_bad_functions(node, stats, _):
  if node.name.startswith('deprecated'):
    stats.increment('deprecated_funcs', node)

and then stats would record basic node info so the final result output contains references explaining how the stats were reached.