Add flag to enable ChaCha suites (draft-mavrogiannopoulos-chacha-tls-01)
Compile fixes
Resurrect algos.rst
Have Skein call Threefish, rather than duplicating the code.
Remove Square, Skipjack, Luby-Rackoff, and Blue Midnight Wish.
Remove the engine hooks
Install command line app
Fix a bug introduced in 1.11.6 where we tried to check CRL signatures
against the wrong key, causing any check to fail.

Clean up the NIST X.509 path validation tests and run them by default.
Fix minimized builds. Patch by Markus Wanner sent to botan-devel