API changes

• Version 1.6 notes and API changes
  • Graph Classes
  • Weighted graph algorithms
  • Isomorphisms
  • Other
• Version 1.5 notes and API changes
  • Weighted graph algorithms
  • Random geometric graph
• Version 1.4 notes and API changes
  • Algorithms changed
• Version 1.0 notes and API changes
  • Version numbering
  • Changes in base classes
  • Additional functions/generators
  • Converting your existing code to networkx-1.0
• Version 0.99 API changes
  • Changes in base classes
  • Other possible incompatibilities with existing code
  • Converting your old code to Version 0.99