More XML DSig test cases

Joseph,

The attached test cases are virtually the same as we the ones we
submitted on May 21, the only difference being that signatures that
exhibited the error referenced in [1] have been fixed.

[1]
http://lists.w3.org/Archives/Public/w3c-ietf-xmldsig/2002AprJun/0182.html

Cheers,
Joe Morgan
Phaos Technology
http://www.phaos.com