Remove unused err.myc example

Update benchmark output for soa_series.myc.
Also, fix the tester to not panic when a baseline is missing, and
instead just report it as missing.

src/ast/rtl/core.rs

@@ -498,7 +498,10 @@ fn register_io(env: &Environment) {
     }));
     env.register_native_fn("print", print_ty, Purity::Impure, |args| {
         for arg in args {
-            print!("{}", arg);
+            match arg {
+                Value::Text(t) => print!("{}", t),
+                _ => print!("{}", arg),
+            }
         }
         println!();
         Value::Void