improved error messages

- some small bugs are now fixed
- include comments in error messages (if this causes issues, use --hide-comments)
- colors should make more sense now
- error-related things moved to mers_lib/src/errors/

mers_lib/src/program/configs/with_base.rs

@@ -5,7 +5,8 @@ use std::{
 
 use crate::{
     data::{self, Data, MersType, Type},
-    program::run::{CheckError, CheckInfo, Info},
+    errors::CheckError,
+    program::run::{CheckInfo, Info},
 };
 
 use super::Config;