A serious optimization of memory copy functions (see blosc/fastcopy.c) .
This benefits the speed of all the codecs, but specially the BloscLZ one.
As a result of the above, the BloscLZ codec received a new adjustment of
knobs so that you should expect better compression ratios with BloscLZ too.
Also, the LZ4 codec internal sources have been updated to 1.8.0. And internal
Zstd sources have been updated to 1.3.3 too.