browser: cover display, compilation support,more

- added optional rendering of cover images in the browser and playlist
  (see http://repose.cx/dump/browser-images.png)
- display artist name if browsing by album
- add `emms-browser-get-track-field-function', which allows you to
  customise the way the browser sorts the cache into various albums,
  artists, etc. includes a function (not on by default) which finds
  the artist name by the directory, not tag info - this prevents
  making lots of top level artist entries for artists who only appear
  on a compilation

darcs-hash:20060629132444-4e3e3-142af90538863a1f655494b24de89ef39ea2a4dc.gz

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