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This commit implements a new capasity to human readable string function
that supports all kinds of speeds ranging from 1k to 1000Exabit++

This removes functions deprecated in networkx 2.1

Python3

See merge request !14

Work also with newer networkx (tested with 2.1).

Reportedly still works with old version.

Also, just return 0.0 for link utilization when we are missing
capacity information for the link and output a warning.

Fixes crash when undoing simulated router failures.

  * Add compatibility with NetworkX >= 1.6.
  * Use simple file reads in pajek.py
  * Add support for 100G interfaces

Remove extra whitespace-suffix for completions. Seems newer python readline versions no longer require this.