update usage and mpd man page to indicate that we now require a config file

doc/mpd.1

@@ -6,10 +6,6 @@ MPD \- A daemon for playing music (mp3, ogg vorbis, and flac)
 .RI [ options ]
 .RI [ CONF_FILE ]
 .br
-.B mpd
-.RI [ options ]
-.I PORT MUSIC_DIR PLAYLIST_DIR LOG_FILE ERROR_FILE 
-.br
 .SH DESCRIPTION
 MPD is a daemon for playing music (mp3, ogg vorbis, and flac).  Music is played
 through the server's audio device.  The daemon stores info about all available

src/main.c

@@ -63,7 +63,6 @@ typedef struct _Options {
 
 void usage(char * argv[]) {
         ERROR("usage:\n");
-        ERROR("   %s [options] <port> <music dir> <playlist dir> <log file> <error file>\n",argv[0]);
         ERROR("   %s [options] <conf file>\n",argv[0]);
         ERROR("   %s [options]   (searches for ~%s then %s)\n",
                         argv[0],USER_CONFIG_FILE_LOCATION,