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[partmesh] Removed the option of `-q` or `--lh_elements` for the impementation of parallel computing with Taylor Hood elements

wenqing requested to merge wenqing/ogs:partmesh_TaylorHood into master

In current parmesh, the option of -q or --lh_elements indicates to generate partitioned meshes and their element properties for the parallel computation with Taylor-Hood elements, which means that linear order elements are used for some variables, while high order elements are used for other variables.

With that option selected, the nodes of partition are stored in the node vector in an order of regular base nodes, regular high order nodes, ghost base nodes, and ghost high order nodes, Without that option selected, the base nodes and high order nodes are not distinguished.

This PR removes that option, and stores the nodes of partition in the node vector in the order of regular base nodes, regular high order nodes, ghost base nodes, and ghost high order nodes.

With the changes, the choice of using Taylor Hood elements is moved to the specific processes.

  1. Feature description was added to the changelog
  2. Tests covering your feature were added?
  3. Any new feature or behavior change was documented?
Edited by wenqing

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