- Refactored cli. The package now installs a **single** command `nexus`, providing several [subcommands](src/nexus/commands). - Dropped python 2 compatibility.
1.63
- fixed an issue where the bin directory wasn't packed on py2.7 (thanks xrotwang)
1.62
- cached DataHandler's _characters_ property to speed up. - cached DataHandler's _symbol_ property to speed up. - cached DataHandler's site parser to speed up.
1.61
- fixed an install issue caused by refactoring.
1.53
- the character block format string `symbols` generated by `NexusReader.write()` no longer includes missing or gap symbols. - fix parsing glitch in NexusReader.DataHandler.parse_format_line.
1.51
- `characters` and `data` block now retain their character labels in `NexusReader`