add 2 file type to mc.ext

[vadim-lvv at yandex.ru]

Hi!

I frequently meet books in chm and djvu format
and propose add in mc.ext:

# chm
regex/\.([cC][hH][mM])$
        Open=(xchm %f >/dev/null 2>&1 &)

# djvu
regex/\.([dD][jJ][vV][uU])$
        Open=(djview %f &)
        View=%view{ascii} djvutxt %f

--
        Sincerely yours,
        Vadim Likhota