Improved support for broken unicode.

Regex support for extra-large character sets not compiled in
if wchar_t is not wide enough for it.
The utf-8 properly throws exceptions when encountering characters
that it cannot represent, instead of silently ignoring the
situation and continuing with incorrectly computed data.

* regex.c (FULL_UNICODE): New macro.
(CHAR_SET_L3, CHAR_SET_L2_LO, CHAR_SET_L2_HI): Only defined
if full unicde is available.
(CHSET_XLARGE, cset_L3_t, struct xlarge_char_set,
L2_full, L3_fill_range, L3_contains): Ditto.
(unon char_set): Member x1 present only under FULL_UNICODE.
(char_set_destroy, char_set_add, char_set_add_range,
char_set_contains): CHSET_XLARGE cases only available on
FULL_UNICODE.
(char_set_compile): Default cst variable to CHSET_LARGE.

* utf8.c (FULL_UNICODE): New macro.
(conversion_error): New function.
(utf8_from_uc): Throw error if not FULL_UNICODE and character is
outside the BMP.
(utf8_decode): Likewise.

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