made codeconv module thread-safe. update search window using timer.
check for HAVE_LOCALE_H and ENABLE_NLS.
added function to change the behavior of character encoding auto-detection.
fixed some character corruption with ...utf8 locale string.
when encoding headers, use outgoing encoding to determine B or Q encoding instead of MB_CUR_MAX.
conv_get_current_locale(): fixed the case when cur_locale is null string.
conv_encode_header(): fixed wrong handling of quotation in continuing multi-byte strings.
conv_encode_header(): force output of UTF-8 if code conversion failed.
fixed stray quote character appearing after encoding mail headers.
fixed a crash when printing a message with empty Subject, From, and To.
win32: fixes character corruption on printing when environment-dependent characters are used in win32.
made workaround for UTF-8 with BOM.
when inserting file, check whole file to see if it is UTF-8.
fixed execution failure when using accessibility module, and character corruption and buffer overflow on sending when using half-width kana.
implemented RFC 2231 filename encoding on send.
supported 'x-sjis' encoding.
fixed locale encoding problem on win32.
support nonstandard encoding 'ks_c_5601-1987'.
changed the locale charset of Japanese Windows from Shift_JIS to CP932.
enhanced the support of environment-dependent Japanese characters.
conv_filename_from_utf8(), conv_filename_to_utf8(): put an assertion.
changed the license of LibSylph from GPL to LGPL.
support UTF-8 in guessing Japanese encoding.
made some core modules library (libsylph).