Provide a way to navigate from the error location to the error explanation

[sim590]

When a ton of errors are in the file and you want to check the error message for highlighted text under the cursor, it is a bit of a pain to go in the other window and search manually for the error. May be a function (and/or mapping) could be written to fix this.

After a quick thought, I guess that #15 is somewhat related in terms of design.