Speed up emms-play-directory-tree by about factor 10

Most of the speedup comes from using nconc in later-do instead
of append (and therefore, not excessively copying lists).
I see a factor of 10 speedup when generating the playlist
for 37000 audio files.

darcs-hash:20070221140553-08870-162cb94182e5e4947a0972a67b9229db8899e7cd.gz

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