A Better Python Cmd Library

The Python cmd module has always been been better than the Ruby imitation (after all like most things about Ruby, it is cheap copy of the original, distinctive feel?) but cmd2 turns this into a real ass-kicking with the following features:

 * Searchable command history (commands: "hi", "li", "run")
 * Load commands from file, save to file, edit commands in file
 * Multi-line commands
 * Case-insensitive commands
 * Special-character shortcut commands (beyond cmd's "@" and "!")
 * Settable environment parameters
 * Parsing commands with flags