Version 1.7.2, 2007-10-13
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* Initialize the global library state lazily
* Add plain CBC-MAC for backwards compatibility with old systems
* Clean up some of the self test code
* Throw a sensible exception if a DL_Group is not found
* Truncate KDF2 output rather than allowing counter overflow
* Add newly assigned OIDs for SHA-2 and DSA with SHA-224/256
* Fix a Visual Studio compilation problem in x509stat.cpp

