small sorting fix

[Mike Jing]

Hi all,

This patch fixes the remaining sorting issues:

-- "Sort by mix" should now work properly: songs with no "mix" tag are 
listed first and no longer treated as if the tag was "None";
-- "Sort by bpm" now uses only the interger value for sorting, to be 
consistent with what's shown in the song list;
-- Added secondary sort keys for "title", "artist", "bpm" and "mix".

Cheers,
Mike Jing

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