Update changelog for 3.4

Closes #1020

See merge request !2591

Feature/pnm noncreepingflow

See merge request !2596

Add more stuff, squash into other commits

Handbook section on scripts

Closes #1019

See merge request !2587

[test] Remove symlink to removed folder

See merge request !2589

[richards][localres][analytic] Fix detector for robin derivatives in problem

Closes #1024

See merge request !2595

Fix/richards analytic storage derivative

Closes #981

See merge request !2574

Katharina Heck authored Apr 28, 2021 and Timo Koch committed May 05, 2021

[richards][test] add robin flux derivative for analytic differentiation in lens and benchmark problem

Test inverseCubicPolynomial and fix a corner case

See merge request !2594

Doxygen - Modules.txt and ingroups

Closes #1010

See merge request !2590

Doc/handbook

Closes #1012

See merge request !2588

Deprecate NumEqVector property

Closes #1016

See merge request !2567

Doxygen update for 3.4

See merge request !2586

Change input parameter group name from SpatialParameters to SpatialParams as SpatialParams already exists while SpatialParameters would be lonely.

[doc] Correct Freeflow to FreeFlow for EnableUnsymmetrizedVelocityGradientForBeaversJoseph, because that is how it is spelled in the code also.

[doc] Remove \b in front of Grid and Newton, as Angular0/1/2 and EnableAbsoluteResidualCriterion won't be the first entries of their category any more in the next step.

[doc] Change the positions of ElectroChemistry.pO2Inlet, Grid.CellType and LoadSolution.PriVarNamesState to where they belong alphabetically.

[bin][runselected] ensure junit report is created

See merge request !2582

[ci] advise openmpi to run as root

See merge request !2581