* examples/print_html_urls.c (html_parse_localfile):
Detect BOM (Byte Order Mark), convert UTF-16 to UTF-8 before parsing.
* include/libwget.h.in: Remove wget_charset_transcode(),
add wget_memiconv() and wget_striconv().
* libwget/encoding.c: Implement wget_memiconv() and wget_striconv()
* src/wget.c (html_parse): Add 'html_len' param,
convert UTF-16 to UTF-8 before parsing.
* tests/test.c: New test for wget_memiconv().