(Vcharset_mojikyo_pj_[1 .. 21]): New variable.

(Vcharset_mojikyo_pj_[1 .. 21]): New variable.
(Qisolated): New variable.
(Qinitial): New variable.
(Qmedial): New variable.
(Qfinal): New variable.
(Qvertical): New variable.
(Qsmall): New variable.
(to_char_code): Use `Qisolated', `Qinitial', `Qmedial', `Qfinal',
`Qvertical' and `Qsmall'.
(Qmojikyo_pj_[1 .. 21]): New variable.
(syms_of_mule_charset): Add new symbols `isolated', `initial',
`medial', `final', `vertical', `small' and `mojikyo-pj-[1 .. 21]'.
(complex_vars_of_mule_charset): Add new charset `mojikyo-pj-[1
.. 21]'.