Pictureflow Bugfixes & Usability fixes

First I discovered a bug in the code to display the currently playing
album from the WPS
--on a NULL id3->albumartist field PF would crash
  now checks for a match in id3->albumartist and then id3->artist
  if neither exists then the search uses <untagged>
  ditto for album

The album index feature (recently added) did not check for enough
room in the buffer on restore
--save and restore code cleaned up a bit
  moved all buffers to their own struct

tracks with no title now show filename rather than <UNTAGGED>

Reworked album search function
 album search was going quadriatic resulting in some outrageous
 index build times [40mins+ for 4000 albums]
 building now done in stages and duplicates removed at end
 *MUCH FASTER*

Album art
 empty album art is no longer stored in the art cache

 PF will now allow you to cancel building album art without
 forcing a rebuild next run,
 it will continue searching for album art in the background
 album art is now updated in the background on each start as well

tracklist now rolls over at the end

artist_index is now discarded after album_index is created

Cleaned up some of the myriad of global variables

Added quit prompt for index building

Added sanity checking for album_index loaded from disk

Change-Id: I8494cb7abcb1ae8645c223fc3c11dc0ee749883a

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