kconv version 0.3 -- changes

from version 0.2

- Thanks to Shouhei Takeuchi takeuchi@isl.ntt.co.jp, I think kconv is 
  allocating a buffer for use with do_kconv() (and freeing it after it's 
  no longer necessary).

- I've renamed the function 'kconv' to 'convert'.
  This WILL break scripts.

Sen Nagata
