[RELEASE] Released version 1.5.14

Released version 1.5.14 with the following main changes :
    - BUILD/MINOR: tools: rename popcount to my_popcountl
    - BUG/MAJOR: buffers: make the buffer_slow_realign() function respect output data
diff --git a/VERSION b/VERSION
index fa85d4d..8df6b88 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-1.5.13
+1.5.14