Fix the inconsistent usage of #if [!]defined XXX compared to defined(XXX)

Thanks-to: Pierre Jolivet

An LLM Claude detected the incosnsitency it was not used to remove the inconsistency

Add automatic generated fortran support for setting and returning contexts

Major cleanup of the code for setting and returning application (previously called user) contexts
- PetscCtx ctx is now t

Add automatic generated fortran support for setting and returning contexts

Major cleanup of the code for setting and returning application (previously called user) contexts
- PetscCtx ctx is now the standard for passing in contexts
- PetscCtxRt ctx is the standard for passing out contexts, including context destroy routines based on PetscCtxDestroyFn

Both of these are typedef to void*

Also removed most use of user and userctx for context arguments now consistently named ctx

Improved documentation on PetscCtx and PetscCtxRt and on how to use contexts (including getting them) from Fortran

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DMSwarm: PIC + FE Landau V spce example

Add make checkshellcheck and shellcheck to use shellcheck on PETSc scripts

Fix missing equal sign

Proper capitalization from Gram-Schmidt orthogonalization

Fix bad decisions made in writing TS.

Fix -ts_dt to -ts_time_step and add initial time step to TSView output

commit a5a92c11fa9681148df375b257eda4e09909b74e
Author: Barry Smith <bsmith@petsc.de

Fix bad decisions made in writing TS.

Fix -ts_dt to -ts_time_step and add initial time step to TSView output

commit a5a92c11fa9681148df375b257eda4e09909b74e
Author: Barry Smith <bsmith@petsc.dev>
Date: Mon Dec 1 14:51:27 2025 -0500

add max_snes_failures to TSView

commit 32d3e79f6fa743930b1bbf32d03b9181b5b5418a
Author: Barry Smith <bsmith@petsc.dev>
Fix wrongly named options and add to TSView

Wrong name for options database key -ts_max_reject should be -ts_max_step_rejections!

Add max_reject value to TSView

Add max_snes_failures to TSView

Add initial timestep to TSView

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Merge remote-tracking branch 'origin/release'

Improve some manual pages for TS

Remove unneeded blank lines

Merge branch 'jrwrigh/tspseudo_improvements' into 'main'

ts(pseudo): Various updates and improvements

See merge request petsc/petsc!8857

Typo

ts(pseudo): Move to TSAdapt-based timestepping

Remove unused code

Fix terminology for Pmat in KSPView output.

Merge branch 'barry/2025-10-24/fix-dmshellsetdestroyctx' into 'main'

Finish converting the function prototypes of destroy for contexts to use PetscCtxDestroyFn

See merge request petsc/petsc!8810

Merge remote-tracking branch 'origin/release'

mpiexec erroneously called ex3, now fixed to call ex4

Updates to get tchem example to build again

Fortran: enforce lower case keywords and operators

also fixed occasional capitals in used modules with the help of @prj-

cleanup suggestions by @BarrySmith

also noticed a few stray functions not marked as external and put them
into modules

use modules instead of external

this allows for argument checking

remove labeled do loops

labeled do loops confused fprettify, so used it to rectify indentation

place all the include statements at the top

Repeated inclusion in multiple location, e.g. at the start of a
module or function is not needed. This becomes clear if all includes are
outside of the ac

place all the include statements at the top

Repeated inclusion in multiple location, e.g. at the start of a
module or function is not needed. This becomes clear if all includes are
outside of the actual Fortran code.
Added regex to check that with the help of @sbalay

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checkbadSource: enforce proper style in makefiles