* Addign safety net to build_dict.sh

        - check rootcint binary is present and issue error message if
          not
        - Error message gives hint of the problem root and suggest
          solution

NPLib/scripts/build_dict.sh

@@ -3,11 +3,14 @@
 # This script detect the root version and call the command necessary to build 
 # a Dictionnary, rootmap and pcm file accordingly
 
+# check rootcint exist
+command -v pipo >/dev/null 2>&1 || { printf >&2 "ERROR : rootcint binary not found.\n * For ROOT install from source check that \$ROOTSYS/bin is in your PATH\n * For Macports ROOT install consider adding /opt/local/bin to your PATH\n * For debian ROOT install consider adding /usr/bin to your PATH\n"; exit 1; }
+
 # Checking that enought argument are given
 if [ "$#" -lt 4 ]
   then
     echo "Dictionnary Generation in : $PWD"
-    echo "Incorrect argument number : 1.Header 2.DictName 3.Rootmap 4.LibName (optional)5.LinkDefFile"
+    echo "Incorrect argument number : 1.Header 2.DictName 3.Rootmap 4.LibName 5.(optional)LinkDefFile"
     echo "Arguments are : $@"
     exit 1
 fi