(enum pvec_type): New member PVEC_SUB_CHAR_TABLE.

(enum pvec_type): New member PVEC_SUB_CHAR_TABLE.
(XSUB_CHAR_TABLE, XSETSUB_CHAR_TABLE): New macros.
(CHAR_TABLE_ORDINARY_SLOTS, CHAR_TABLE_SINGLE_BYTE_SLOTS,
SUB_CHAR_TABLE_ORDINARY_SLOTS, SUB_CHAR_TABLE_STANDARD_SLOTS):
Deleted.
(CHAR_TABLE_REF, CHAR_TABLE_SET): Adjusted for the new char table
structure.
(CHAR_TABLE_TRANSLATE): Just call char_table_translate.
(CHARTAB_SIZE_BITS_0, CHARTAB_SIZE_BITS_1, CHARTAB_SIZE_BITS_2,
CHARTAB_SIZE_BITS_3): New macros.
(chartab_size): Extern it.
(struct Lisp_Char_Table): Re-designed.
(struct Lisp_Sub_Char_Table): New structure.
(HASH_KEY, HASH_VALUE): Moved from fns.c.
(CHARACTERBITS): Defined as 22.
(GLYPH_MASK_FACE, GLYPH_MASK_CHAR): Adjusted for the above change.
(SUB_CHAR_TABLE_P): Check PVEC_CHAR_TABLE.
(GC_SUB_CHAR_TABLE_P): New macro.
(Fencode_coding_string, Fdecode_coding_string): EXFUN Updated.
(code_convert_string_norecord): Extern deleted.
(init_character_once, syms_of_character, init_charset,
syms_of_composite, Qeq, Fmakehash, insert_from_gap): Extern them.