Remove the old multiresolution implementation
Description
The old multiresolution implementation only worked for one region and one additional resolution and only in serial. Moreover, it hasn't been worked on for over 10 years. It is removed because it is intricately linked to the lxyz and lxyz_inv arrays that are going to be changed soon.
It is planned to have a new implementation that overcomes these issues.
News snippet
Remove old multiresolution implementation
Checklist
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I have checked that my code follows the Octopus coding standards