TSDIRK: add docs and python bindings

use TR-BDF2 as default
update documentation

TSDIRK: Diagonally Implicit Runge Kutta

Reuse ARKIMEX code
add additive boolean to the struct
improve code readibility
tweak requirements for identity mass matrix in additive methods
Fix bug in not

TSDIRK: Diagonally Implicit Runge Kutta

Reuse ARKIMEX code
add additive boolean to the struct
improve code readibility
tweak requirements for identity mass matrix in additive methods
Fix bug in not copying last Ydot from previous step in ARKIMEX

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Delete unused code

Add static to internal functions

TS: improve code readibility for TSRK and TSROSW

TSSolve: fix bug when u is NULL and interpolate is requested

Fix typos

Fix missing new lines at the end of PetscInfo() calls

Add convenience functions VecCreateFromOptions() and MatCreateFromOptions() to reduce the use of specialize creation routines in the examples and thus make it easier for people to use GPU based solve

Add convenience functions VecCreateFromOptions() and MatCreateFromOptions() to reduce the use of specialize creation routines in the examples and thus make it easier for people to use GPU based solvers

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Profiling: Improve !defined(PETSC_USE_LOG) #defines

- If we cast macro arguments to void, we can avoid unused errors that have
forced lots of conditionally included code like this:

```c
#if def

Profiling: Improve !defined(PETSC_USE_LOG) #defines

- If we cast macro arguments to void, we can avoid unused errors that have
forced lots of conditionally included code like this:

```c
#if defined(PETSC_USE_LOG)
PetscLogEvent event;
#endif
```

- Having global counters like petsc_TotalFlops externed event
if !PetscDefined(USE_LOG) helps to remove a lot of needless
`#ifdef`s around code that can instead be placed in
`if (PetscDefined(USE_LOG)) {}` blocks.

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Fix the places that should be using PETSC_STATIC_ARRAY_LENGTH

... and apply it

Manual linter fixes: ts

Rename VecChop() into VecFilter()

Fix PetscAssertPointer that should be PetscValidHeaderSpecific

Rename PetscValidPointer -> PetscAssertPointer

Deploy new PetscValidPointer, remove PetscValidXXXPointer

Merge remote-tracking branch 'origin/release'

Merge branch 'stefanozampini/tstheta' into 'main'

Small optimizations in TSTHETA

See merge request petsc/petsc!6723

Correct the description of the basic symplectic integrator

Merge remote-tracking branch 'origin/release'

MatEliminateZeros(): skip zero nondiagonal coefficients

TSTHETA: small optimization

save from useless AXPYs if not endpoint variant

TS tutorials ex45: proof of concept for remeshing

added partial support for DMFOREST

TSCONVEST: must take reference on uInitial