Upgrade to dantro 0.10 and integrate DAG framework

With %Version 0.10 in dantro (dantro!113 (merged)) nearing completion, this issue is to plan its integration into utopya.

To Do

• Update requirement and use corresponding release branch in installation
• Check that everything works
• Make DAG framework available via more convenient imports, e.g. in utopya.plotting
• Let the CopyMe model use DAG-based plots
• Write a doc page instructing on the use of the DAG framework for plots
  • Link to (now online) dantro docs, where there is more information on the DAG and the plotting framework
  • (While at it, also write a paragraph on how to access the configuration, as @herdeanu remarked here)