Changes 1.6.0:
* Fix: wrong namespace in encryption DigestMethod
* Fix: RetrievalMethod handler
* Fix: support for >1 CRL per KeyInfo
* Fix: buffer initialization issue
* Fix: vector index bug
* Fix: stylesheet append bug
* Fix: header guard in XPath transform header
* Fix: string release crash
* Fix: improper c14n of XSLT
* Fix: setters for Reference Type/Id
* Fix: skip comments in X509Certificate elements
* Fix: more header guards
* Fix: NSS verification of RSA broken
* Expose algorithm URI on Signature and Reference objects
* White/blacklisting of otherwise registered algorithms
* Add selected XML Signature 1.1 KeyInfo extensions
* Add elliptic curve keys and signatures via ECDSA
* Support debugging of Reference/SignedInfo data
* Clean up tests for SHA2 algorithms in OpenSSL
* Updated autoconf script, added NSS support, removed pre-automake material
* Add methods for Reference removal to DSIGSignature/DSIGSignedInfo classes

(adam)