port 10304 from 1.1: Advertise trace change

ChangeLog

@@ -150,6 +150,8 @@ Small features:
   * New function starpu_get_version() to return as 3 integers the
     release version of StarPU.
   * Enable by default data allocation cache
+  * Explicitly name the non-sleeping-non-running time "Overhead", and use
+    another color in vite traces.
 
 Changes:
   * Rename all filter functions to follow the pattern