* src/charset.c (utf8_to_local, low_utf8_to_local): Implemented
control character fitlering. Replaced STRICT argument with two
flags utf8_replace and utf8_paranoid.
(ucs4_is_control): New function.
(local_is_utf8): Deleted function.

Rev: src/charset.c:1.12
Rev: src/charset.h:1.8