new:
readline.get_begidx() -> int
	gets the beginning index in the command line string
	delimiting the tab-completion scope.  This would
	probably be used from within a tab-completion
	handler

readline.get_endidx() -> int
	gets the ending index in the command line string
	delimiting the tab-completion scope.  This would
	probably be used from within a tab-compeltion
	handler

readline.set_completer_delims(string) -> None
	sets the delimiters used by readline as word breakpoints
	for tab-completion

readline.get_completer_delims() -> string
	gets the delimiters used by readline as word breakpoints
	for tab-completion

fixed:
readline.get_line_buffer() -> string
	doesnt cause a debug message every other call