Decryption transform interop samples

The remaining decryption transform issues shouldn't have much
effect on interop, so attached are some (hopefully functional)
interop samples to kick things off.

Joseph, I've also been asked if you could add
  http://www.baltimore.com/keytools/xml/
to your list of dsig/enc/... implementations/interop links.

Merlin

See the Readme.txt for details on the interop samples; this
is a quick list. They're all basic AES-128, DSA and SHA-1.

. decrypt-xml.xml
  XML-mode decryption transform

. decrypt-xml-except.xml
  XML-mode decryption transform with exception

. decrypt-xml-except-external.xml
  XML-mode decryption transform with exception in external document

. decrypt-xml-except-xpointer.xml
  XML-mode decryption transform with XPointer exception (non-mandatory)

. decrypt-xml-except-unresolvable-xpointer.xml
  XML-mode decryption transform with irrelevant but unresolvable exception

. decrypt-xml-super.xml
  XML-mode decryption transform over super-encrypted data

. decrypt-xml-super-except.xml
  XML-mode decryption transform with exception in super-encrypted data

. decrypt-xml-empty-xmlns.xml
  XML-mode decryption transform demonstrating apex xmlns="" output

. decrypt-xml-inherit-attr.xml
  XML-mode decryption transform demonstrating xml attribute inheritance

. decrypt-xml-super-inherit-attr.xml
  XML-mode decryption transform demonstrating xml attribute inheritance
  in super-encrypted data

. decrypt-xml-xpath.xml
  XML-mode decryption transform with XPath filter instead of exception

. decrypt-xml-none.xml
  XML-mode decryption transform with no encrypted data

. decrypt-xml-undecryptable.xml
  XML-mode decryption transform with undecryptable data; should fail

. decrypt-xml-bad-type.xml
  XML-mode decryption transform with an unknown type; should fail

. decrypt-binary.xml
  Binary-mode decryption transform

. decrypt-binary-except.xml
  Binary-mode decryption transform with exception

. decrypt-binary-multiple.xml
  Binary-mode decryption transform with multiple encrypted data

. decrypt-binary-none.xml
  Binary-mode decryption transform with no encrypted data