[flac-dev] Retuning compression levels

[Martijn van Beurden]

As I haven't heard any complaints concerning the proposal for 
retuning compression levels which I posted a few months ago, 
here's the patch that enables them, with the change proposed by 
lvqcl.

This patch changes the settings associated with compression 
levels 6, 7 and 8. With this patch, -e is no longer used, but 
instead apodization functions are added. This should improve 
compression with at least 95% of all material. Independent tests 
show that this is probably the case.

The encoding speed should stay about the same, however, 6 is 
slowed considerably, positioned between compression levels 5 and 
7. This was done because level 6 was so close to level 5 that it 
wasn't really worth using. Decoding-wise, 6 and 8 stay the same, 
and 7 is slowed a bit, which makes it as fast as 8.
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