Add logic to check for incompatible parameters

[rvhonorato]

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This PR adds a logic to check for parameter incompatibilities.

For example; with #918 I added a new parameter called less_io however you cannot use this parameter together with mode=batch.

So now you can define a new incompatible property of a given parameter in the haddock.modules.defaults.yaml;

less_io:
  # ...
  incompatible:
    mode: batch

Which will then be validated when the run is being setup.