- scary commit -

- scary commit -
add a generic botan1.8/botan1.9 signer/verifier for RSA
refactor the signer/verifier API so the more code moves out of the per-engine interface
add the ability to have multiple enginers for a single algorithm, plus add the notion of a 'fallback' engine, in our case polarssl
update some copyright statements

git-svn-id: svn://svn.powerdns.com/pdns/trunk/pdns@1951 d19b8d6e-7fed-0310-83ef-9ca221ded41b