Combine release notes into single text file on install
Untested support for using CryptGenRandom in System_RNG
Nullptr cleanup
Add --with-everything option
Add KEM scheme for McEliece
Remove the Overbeck conversion at Dr. Strenzke's request.

While a CCA2 proof of this scheme exists, it is written in German and
for various reasons publishing a translation would be a complicated
affair. Without a (well studied) English proof it is harder to
understand the security of the overall scheme. Thus only KEM, which
seems much easier to prove, will be offered.