Major changes, including Brotli and Lizard

- update of zstd-mt library
- add brotli v0.6.0
- add lizard v2.0
- xxhash is from zstd for lz4, lz5 and lizard now
- update also the documentation, where needed

C/lizard/LZ5_to_LIZ.sh

@@ -0,0 +1,14 @@
+#!/bin/sh
+# C/lizard/*
+# /TR 2017-05-25
+
+for i in *.c *.h; do
+  sed -i 's/LZ5_/LIZ_/g' "$i"
+  sed -i 's/LZ5F_/LIZF_/g' "$i"
+  sed -i 's/"lz5_/"liz_/g' "$i"
+done
+
+for f in lz5*; do
+  l=`echo $f|sed -e 's/lz5/liz/g'`
+  mv $f $l
+done