[Cin] flac 1.4.0

[Andrea paz]

> Any thoughts??

In terms of performance it changes little to upgrade to 1.4. But being
able to set the compression from gui and also keeping the possibility
of further optimizations in the future make me think that it is better
to upgrade to 1.4.
As a default you can keep the compression at "0" and leave the
possibility to change it if the user needs to privilege space over
speed.