update version for networkx-1.7 release

Update release for networkx-1.7rc1

networkx-1.6 release

networkx-1.6rc1 (release candidate)

set version to networkx-1.5

update news

Remove tags

networkx-1.4 release update

Rename release variable.

Update doctest

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extra : convert_revision : svn%3A3ed01bd8-26fb-0310-9e4c-ca1a4053419f/networkx/trunk%401932

Update label dev version 1.3

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extra : convert_revision : svn%3A3ed01bd8-26fb-0310-9e4c-ca1a4053419f/networkx/trunk%401818