changed public key export format to (slightly modified) RFC4880 style (openpgp format).

Current state is totally unstable, it's not yet ready.

man/pcp1.pod

@@ -33,8 +33,8 @@ Pretty Curved Privacy - File encryption using eliptic curve cryptography.
   -S --import-secret        Import a secret key.
   -P --import-public        Import a public key.
   -y --export-yaml          Export all keys as YAML formatted text.
-  -b --pbpcompat            Enable PBP compatibility for public key
-                            exports and imports.
+  -F --export-format <fmt>  Specify exportformat, either 'pbp' or 'pcp'.
+                            'pcp' is the default if unspecified.
   Encryption Options:
   -e --encrypt              Asym-Encrypt a message. If none of -i or -r
                             has been given, encrypt the message symetrically.