TODO to distribute
  o fix bug of implementation of on-the-spot style
      use caret callback
  o fix bug of use libanthyinput
  o more interaction with UI
  o make candidate window (at UI)

  o fix broken English. ;)
  o documentation

future ideas
  o select conversion method dynamically

I have no idea. please help.
  o tune up over-the-spot style draw routine.
  o fix bug happend at using with kterm(I don't know why this bug occurs. 
    Maybe Xlib is bogus)
