Improved the root installation to prevent misleading behaviour for the user...

Improved the root installation to prevent misleading behaviour for the user (script replaced by  a shortcut to the real command).
Added colors.

dist/make-install.py

@@ -11,7 +11,8 @@ map = {
 	"APP":			"OTAWA",
 	"DB_URL":		"http://tracesgroup.net/otawa/packages/2.0",
 	"DB_CONF":		"share/Otawa/install.xml",
-	"DEFAULT":	"otawa"
+	"DEFAULT":		"otawa",
+	"DEFAULT_PATH":	"otawa"
 }
 path = "otawa-install.py"