The startup script now output a warning if the binary is missing

Tells the user to read the INSTALL file first.

vlmc

 #!/bin/sh
 
-exec bin/vlmc "$@"
+BIN="bin/vlmc"
+if [ -f $BIN ]; then
+    exec $BIN "$@"
+else
+    echo "VLMC not build, read INSTALL first"
+fi