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.
The function shuffles the virtual order of songs, but does not move
them physically. This is used in random mode.
The new function replaces playlist.c's randomizeOrder() function,
which was aware of playlist.current and playlist.queued. The latter
is always -1 anyway, and the former as preserved by the caller, by
converting playlist.current to a position, and then back to an order
number.
Avuton Olrich