Update argument handling and tracing args

Signed-off-by: Ralf Zerres <ralf.zerres@networkx.de>

src/parse_args.rs

@@ -9,9 +9,7 @@ use viperus::Viperus;
 /// The given Viperus structure will be muted according to the
 /// processed default, environment and commandline arguments
 pub fn parse_args(v: &mut Viperus) -> Result<(), Box<dyn std::error::Error>> {
-    //use log::{debug, info, trace, warn};
-    //use log::trace;
-    use tracing::{trace, Level};
+    use tracing::trace;
     use std::env;
 
     if cfg!(feature = "yaml") {