[doc] Rename usage documentation to Understanding Dumux

See merge request !3937

[gridwriter] Fix return type in forwarding function

See merge request !3935

This makes the function work for std::vector<bool>. T is bool
but values[0] returns (non-standard-compliant in some impl.) some proxy reference class
even if the container is const. Explicitly converting to T (or generally for ranges
std::ranges::range_value_t)  works.
Thed default return type would be auto which also returns by value.

Feature/eval simple string expression

See merge request !3933

[io] Fix unused capture this

See merge request !3930

Fix two types of Cppcheck warnings

See merge request !3923

Found by Cppcheck (noExplicitConstructor).

Found by Cppcheck (uselessCallsSubstr).

Merge branch '1356-test-porousmediumflow-2pncmin-nonisothermal-neumann-flux-at-top-has-to-be-adapted' into 'master'

Resolve "[test][porousmediumflow][2pncmin][nonisothermal] Neumann flux at top has to be adapted"

Closes #1356

See merge request !3761

Anna Mareike Kostelecky authored 3 months ago and Timo Koch committed 3 months ago

* use reference density in air
* average pm and air contribution for tpfa
* update reference solution

[doc] Update installation.md with cmake and dune requirement

See merge request !3926

[cmake][deps] Add back accidentally removed option DUMUX_ENABLE_GRIDFORMAT

See merge request !3925

[cmake][python] Fix python lib link to Dumux

See merge request !3924

Cleanup/projector

See merge request !3920

Feature/improve cmake setup

See merge request !3899

If a downstream package uses GLPK they have to find and link it themselves

[bboxtree] add lower bound on eps

Closes #1422

See merge request !3921

Require dune 2.10

See merge request !3901