Propagate line nr and column when validating config

[oyvindeide]

In Everest there is not tie back to the config file when the configuration is validated, however because we use ruyaml to parse the file, the line number and column information is already extracted and propagated. We should make sure that this is propagated all the way back to the user, take a modified math_func example:

adding:

simulator:
  queue_system: docal

will give:

everest run config_advanced.yml
usage: everest run <config_file> [arguments]
everest: error: Loading config file <config_advanced.yml> failed with:
Found  1 validation error:

simulator -> queue_system
    * Input should be 'lsf', 'local', 'slurm' or 'torque' (type=literal_error)

This should also give me the line in the config file where the error has occurred, and say which file this occurred in.