[SCM] Debian packaging for nauty branch, build, updated. debian/2.4b7rc4-6-g42d84a4

[David Bremner]

The following commit has been merged in the build branch:
commit 0c4fad139fbc1be7fe3f6407186ab7bb8e819af7
Merge: 4b0aab009132cb73d0e931e2db63b3cc5bc1d436 ab55363075d6ee261bfcbc5bbf9448418a5251a9
Author: David Bremner <bremner at unb.ca>
Date:   Sun Sep 13 09:20:26 2009 -0300

    Merge commit 'pivot/master' into build


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Debian packaging for nauty