g_file_test is redefined to be g_file_test_utf8 and thus can't handle
non-ASCII characters. This fix adds simple wrapper (taken from glib)
that fixes encoding and calls g_file_test_utf8. All required inclusions
of glib_compat.h are added as well.

Improve error reporting and handling.  command.c gets the new function
print_error(), which sends a GError to the client.

Reduce header dependencies.

Allocate a player_control object where needed, and pass it around.
Each "client" object is associated with a "player_control" instance.

This prepares multi-player support.

This fixes an inconsistency in the stored playlist subsystem: when
obtaining the list of playlists (listplaylist, listplaylistinfo), the
file names in the playlist directory are converted to UTF-8 (according
to filesystem_charset), but when saving or loading playlists, the
filesystem_charset setting was ignored.

After we've been hit by Large File Support problems several times in
the past week (which only occur on 32 bit platforms, which I don't
have), this is yet another attempt to fix the issue.

Try to be as portable as possible, use GLib path name functions and
macros.

This updates the copyright header to all be the same, which is
pretty much an update of where to mail request for a copy of the GPL
and the years of the MPD project. This also puts all committers under
'The Music Player Project' umbrella. These entries should go
individually in the AUTHORS file, for consistancy.

"ls" is a bad name for a library which parses URIs.  We'll move the
rest of the "ls" library later.

spl_save_playlist() is a wrapper for spl_save_queue().

Export the "g_playlist" variable, and pass it to all playlist
functions.  This way, we can split playlist.c easier into separate
parts.  The code which initializes the singleton variable is moved to
playlist_global.c.

Don't declare and export variables specific to stored playlists in
playlist.c/playlist.h.

Don't use fixed static buffers.  GLib allocates a new string for us
anyway, let's just return this one instead of copying it.

For internal checks (i.e. not in command.c), we need to check whether
an URI is in the databse, in the local file system or a remote URI
with a scheme.

Don't use fixed stack buffers.

Don't use fixed stack buffers.

When save_absolute_paths_in_playlists was enabled in mpd.conf, MPD
broke all playlists when manipulated using the "playlistdelete"
command.  The reason was that map_directory_child_fs() was used, which
doesn't accept slashes in the file name.  Use the new map_uri_fs()
function instead.

The function didn't do anything useful, it was just several lines
obfuscating that it was only forwarding isRemoteUrl()'s return value.

Nearly all mapper functions can fail and will then return NULL.  Add
checks to all callers.

Don't attempt to map paths which are already absolute with
map_song_fs(): check with song_in_database() instead of
song_is_file().

Instead of the uninitialized local variable "s", I should have used
"uri".

The mapper library maps directory and song objects to file system
paths.  With this central library, the code mixture in path.c should
be cleaned up, and we will be able to add neat features like aliasing.

playlist_print_song() and playlist_print_uri() handle charset
conversion and (optional) music directory prefixing.

Search'n'replace typo..

Yet another CamelCase removal patch.

The same can be achieved with directory_print(db_get_directory()).

Taming the directory.c monster, part II: move the database management
stuff to database.  directory.c should only contain code which works
on directory objects.

The struct can be forward-declared by other headers, which relaxes the
header dependencies.

exploreDirectory() duplicates some code in updateDirectory().  Merge
both functions, and use directory_is_empty() to determine whether
update or explore mode should be used.