Remove buggy usage of M_ICONV_HOOK_TO flag in mutt_idna.c:mutt_idna_to_local().

Wipe unwanted code depending on M_ICONV_HOOK_TO in charset.c:mutt_iconv_open().
Totally wipe M_ICONV_HOOK_TO symbol.
Remove misusages of M_ICONV_HOOK_FROM flag in:
 - crypt-gpgme.c:print_utf8().
 - mutt_idna.c:mutt_idna_to_local() and mutt_local_to_idna().
 - pgp.c:pgp_traditional_encryptsign().
Document usage policy of M_ICONV_HOOK_FROM flag.
Cosmetic downcasing of some constant charset names (utf-8, euc-jp) for consistency.
Correction of a typo in the "iso8859-5" charset name.

1 files changed, 6 insertions, 2 deletions

diff --git a/charset.h b/charset.h
index 3fba1cce..ab5f062b 100644
--- a/charset.h
+++ b/charset.h
@@ -49,7 +49,11 @@ void fgetconv_close (FGETCONV **);
 void mutt_set_langinfo_charset (void);
 char *mutt_get_default_charset ();
 
-#define M_ICONV_HOOK_FROM 1
-#define M_ICONV_HOOK_TO   2
+/* flags for charset.c:mutt_convert_string(), fgetconv_open(), and
+ * mutt_iconv_open(). Note that applying charset-hooks to tocode is
+ * never needed, and sometimes hurts: Hence there is no M_ICONV_HOOK_TO
+ * flag.
+ */
+#define M_ICONV_HOOK_FROM 1	/* apply charset-hooks to fromcode */
 
 #endif /* _CHARSET_H */