0.1.5   Fixed a segmentation fault when using pcp1 -t on a
	public key. I added a double free() there by purpose
	to test segfault catching I added in unittest.pl
	and forgot to remove it. The good news is, that
	I found the double free() immediately thanks to the
	segfault catching of unittest.pl :)

	Fixed use of unencrypted secret keys, added proper
	unittests for this case. Note: a secret key will
	be stored unencrypted if the user doesn't enter
	a password when asked. In addition to the fix I
	added a question if the user is sure about what
	he does.

	Moved config.h to include/pcp/ so it will be
	installed as well. Removed the conditional include
	of config.h in platform.h, that was stupid.

	Added generation of a pkg-config configuration
	in libpcp/libpcp1.pc.in.

	Added -O support to -k. So now you can generate
	a new secret key and export it directly into a
	file. In this case the key will not be stored to
	the vault.

	The -t option now accepts an inputfile (-I) and
	determines what kind of file that might be and
	if it finds out, prints some info about it to
	stdout. Useful if you've got a z85 encoded file
	without headers and comments and don't know what
	it is.

0.1.4   Changed key format (again), now the main secret
	is the ED25519 secret key, which will be encrypted.
	Everything else will be derived from that. Thanks
	to S.Neives and "CodesInChaos" from the libsodium
	mailinglist for clarifying it and helping me to
	understand it.

0.1.3   Added signature support using ED25519.

	Key format has changed it now contains the ed25519
	public key part as well, required for signing. Key
	version is now 0x2 and vault version 0x2. There's
	no backwards compatibility, since this is still beta.

	Re-organized header files.

	Added support for self encryption using the users
	own key pair for encryption and decryption.

	Backport of issue https://github.com/zeromq/zeromq4-x/issues/29

	Fixed key export, now uses big endianess as well.

	Updated POD documentation.

	Fixed a couple of minor bugs which lead to crashes.

	Options -r and -R exchanged: -R = remove key, -r =
	recipient.

	Added support for derived keys (using -r).

	Added more precautions when writing to the vault,
	we now always use a tmp vault for writing and if that
	works, we copy it back. In case something fails on
	the way, the tmp file will be retained or the original
	vault will not be altered.

0.1.2   Fixed bug in pcp_derivekey() which derives encryption
	keys. it generated collisions due coding error, e.g.
	passphase 'a' resulted in the same encryptionkey as
	passphase 'r'. Now uses SHA256 witout the xor stuff,
	which was the cause for the bug. This also fixes a
	segmentation fault which occured invariably by entering
	an invalid passphrase.

	Added support for derived public keys using the -R
	option, which allows two peers to encrypt messages
	without the need to reveal their primary public keys.
	That way each peer will have another public key of
	the same source.

	Added more unit tests to reflect the above changes.

0.1.1   Changed output format of encrypted keys. now we
        encode it properly with the Z85 encoding and add
        a header and footer to it:

         -----BEGN CURVE25519 SECRET KEY-----
         0q<1MspXp=x>mBZsUJF:2#)o*!.nTKR8SK}0IfuMBmC1a&*?)JD4%$%I5<J2jj%m/k&$?lck
         EIKTfhPnSR8Vvcu9i7Znf/v+ZvU<}K#v@+t#5]i{9FGgJT$Lu*i+<-we&P9+)6LjN=NW(PLYt
         EU]wBzf{UrCgBNSHcGBT
         -----END CURVE25519 SECRET KEY-----

0.0.1   Initial version