updated argument parsing to correctly print help/usage messages
added str() wrapped around non-strings
remove usage message based on rc, now handled in PypsiArgParser
updated to latest argument api
updated terminology
added Namespace.__iter__()
* added History wrapper around readline
* added subcommand implementations
* fixed help/usage messages
added safe_open() to detect character encoding
updated to python 3 compatibility
added chardet dependency
updated to python 3 and add list functionality
adds block to shell.ctx rather than relying on get_plugin()
updated to latest argument api
updated to python 3 and added support or callable usage messages
updated to python 3
updated to python 3
updated to python 3