cmdline: removed options --create-db and --no-create-db

Both options are deprecated, and should not be used anymore.  Many
users get confused by their presence.

doc/mpd.1

@@ -25,12 +25,6 @@ Output a brief help message.
 Kill the currently running mpd session.  The pid_file parameter must be
 specified in the config file for this to work.
 .TP
-.BI --create-db
-Force (re)creation of database.
-.TP
-.BI --no-create-db
-Do not create database, even if it doesn't exist.
-.TP
 .BI --no-daemon
 Don't detach from console.
 .TP

doc/mpdconf.example

@@ -353,8 +353,7 @@ input {
 # Character Encoding ##########################################################
 #
 # If file or directory names do not display correctly for your locale then you 
-# may need to modify this setting. After modification of this setting mpd 
-# --create-db must be run to change the database.
+# may need to modify this setting.
 #
 #filesystem_charset		"UTF-8"
 #