Version 1.5.9, 2006-07-12
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* Fixed bitrot in the AEP engine
* Fix support for marking certificate/CRL extensions as critical
* Significant cleanups in the library state / initialization code
* LibraryInitializer takes an explicit InitializerOptions object
* Make Mutex_Factory an abstract class, add Default_Mutex_Factory
* Change configuration access to using global_state()
* Add support for global named mutexes throughout the library
* Add some STL wrappers for the delete operator
* Change how certificates are created to be more flexible and general

