update: added options which control symlink behaviour

The configuration options "follow_outside_symlinks" and
"follow_inside_symlinks" let the user control whether MPD should
follow symbolic links in the music directory.

[mk: converted variables to "bool"; moved configuration to
update_global_init()]

doc/mpd.conf.5

@@ -35,6 +35,17 @@ This specifies the directory where music is located.
 .B playlist_directory <directory>
 This specifies the directory where saved playlists are stored.
 .TP
+.B follow_outside_symlinks <yes or no>
+Control if MPD will follow symbolic links pointing outside the music dir.
+You must recreate the database after changing this option.
+The default is "no".
+.TP
+.B follow_inside_symlinks <yes or no>
+Control if MPD will follow symbolic links pointing outside the music dir, potentially
+adding duplicates to the database.
+You must recreate the database after changing this option.
+The default is "yes".
+.TP
 .B db_file <file>
 This specifies where the db file will be stored.
 .TP

doc/mpdconf.example

@@ -7,6 +7,8 @@ playlist_directory              "~/.mpd/playlists"
 db_file                         "~/.mpd/mpd.db"
 log_file                        "~/.mpd/mpd.log"
 error_file                      "~/.mpd/mpd.error"
+#follow_outside_symlinks         "no"
+#follow_inside_symlinks          "yes"
 ################################################################