common.c:	public functions for both the backend and the frontend.
		requires conv.c and wchar.c
conv.c:		static functions and a public table for code conversion
wchar.c:	mostly static functions and a public table for mb string and
		multi-byte conversion
mbutilc.c:	public functions for the backend only.
		requires conv.c and wchar.c
wstrcmp.c:	strcmp for mb
wstrncmp.c:	strncmp for mb
varable.c:	public functions for show/set/reset variable commands
alt.c:		a tool to generate KOI8 <--> CP866 conversion table
iso.c:		a tool to generate KOI8 <--> ISO8859-5 conversion table
win.c:		a tool to generate KOI8 <--> CP1251 conversion table
big5.c:		conversion between BIG5 and Mule Internal Code(CNS 116643-1992
		plane 1 and plane 2).
utftest.c:	test driver for utf2wchar()