Remove pgpdump dependency.
Spelling.
Add signature types to constants.
Fix attribute naming.
Add user attribute image subpacket image formats to constants.
Fix old packet header length construction.
Add a few useful repr definitions.
Funtions for signature hashing.
Fix public key content data property.
Fix a few imports.
More signature types added to signature hashing function.
Fixes for byte-manipulation functions.
Add code for parsing GnuPG-style user IDs with comments.
Add simple packet parser shortcuts.
Add code for armor & CRC-24 generation / parsing.
Initial stab at models of higher-level contructs, as opposed to packets.
Bit length function moved to models.