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MPI p4est parabolic 2D nonconforming AMR with loadbalancing (#2888)

* added IndicatorPositional to enable refinment based on rule(x,t)

* corrected minior duplication, added testcase later used for MPI Mortar tests

* corrected spelling

* Update src/solvers/dgsem/indicators.jl

Included suggested style improvments

Co-authored-by: Daniel Doehring <doehringd2@gmail.com>

* Update src/solvers/dgsem/indicators.jl

update Naming to indicator_function

Co-authored-by: Daniel Doehring <doehringd2@gmail.com>

* Update src/solvers/dgsem/indicators.jl

changed naming

Co-authored-by: Daniel Doehring <doehringd2@gmail.com>

* Update src/solvers/dgsem/indicators.jl

changed naming

Co-authored-by: Daniel Doehring <doehringd2@gmail.com>

* Update src/solvers/dgsem/indicators.jl

changed naming

Co-authored-by: Daniel Doehring <doehringd2@gmail.com>

* changed behaviour to take maximum of node based evaluation

* Update src/solvers/dgsem/indicators.jl

* Update src/solvers/dgsem_tree/indicators_1d.jl

Co-authored-by: Daniel Doehring <doehringd2@gmail.com>

* Update src/solvers/dgsem_tree/indicators_2d.jl

Co-authored-by: Daniel Doehring <doehringd2@gmail.com>

* Update src/solvers/dgsem_tree/indicators_3d.jl

Co-authored-by: Daniel Doehring <doehringd2@gmail.com>

* enabled MPI for 2D parabolic system on P4est mesh (from present main)

* extended indicator to allow also solution dependent updates, inidial value now -Inf

* corrected dimension mismatch indicator_3d, added 1D testcase by exchanging IndicatorMax with equivalent IndicatorPositional

* mortar addition in progres

* adapted naming: viscous -> parabolic

* 2D MPI P4est parabolic system with mortar treatment, AMR and load balancing

* added AMR load balancing testcase

* correctly merging

* removed testcases

* improved comments

* Apply suggestions from code review

Co-authored-by: Joshua Lampert <51029046+JoshuaLampert@users.noreply.github.com>

* added testcase for inverted index

* remove... (continued)

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