* crypto: implement automagic decryption when so requested

(mainly by adding some smartness to various part_foreach functions, adding
  mu_msg_(get|set)_auto_decrypt to mark a message for auto-decryption)

lib/mu-msg-part.h

@@ -123,7 +123,7 @@ typedef struct _MuMsgPart MuMsgPart;
  *
  * @return utf8 string for this MIME part, to be freed by caller
  */
-char* mu_msg_part_get_text (MuMsgPart *part, gboolean *err);
+char* mu_msg_part_get_text (MuMsg *msg, MuMsgPart *part, gboolean *err);
 
 
 /**
@@ -211,6 +211,8 @@ gchar* mu_msg_part_filepath_cache (MuMsg *msg, guint partid)
  */
 int mu_msg_part_find_cid (MuMsg *msg, const char* content_id);
 
+
+
 /**
  * retrieve a list of indices for mime-parts with filenames matching a regex
  *