Minor cleanup of Fortran binding stuff to simplify future maintainance

There is no distinction between F90 and non-F90 code so combine ftn-custom and f90-custom directories and fortranimpl.h and f90

Minor cleanup of Fortran binding stuff to simplify future maintainance

There is no distinction between F90 and non-F90 code so combine ftn-custom and f90-custom directories and fortranimpl.h and f90impl.h files. Also move uses of f90 to ftn when simple

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Fix assorted rendering issues

Remove unnecessary dev note

Fortran: fix PETSC_HAVE_FORTRAN_UNDERSCORE defs

And remove FORTRANDOUBLEUNDERSCORE, cleanup PETSC_HAVE_FORTRAN_UNDERSCORE_UNDERSCORE

Revert PETSC_VIEWER_STDOUT_BROKEN from 5022eb3e26e9dbfdd711345ef

Fortran: fix PETSC_HAVE_FORTRAN_UNDERSCORE defs

And remove FORTRANDOUBLEUNDERSCORE, cleanup PETSC_HAVE_FORTRAN_UNDERSCORE_UNDERSCORE

Revert PETSC_VIEWER_STDOUT_BROKEN from 5022eb3e26e9dbfdd711345efc14d09b0dee953f

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Fortran 90: fully embrace After 34 years!

- deprecate use of 'F90' in Fortran function names
- use Fortran pointers when appropriate
- the new Fortran API is not backward compatible with previous ve

Fortran 90: fully embrace After 34 years!

- deprecate use of 'F90' in Fortran function names
- use Fortran pointers when appropriate
- the new Fortran API is not backward compatible with previous versions!
- also clean up inconsistent PETSc code detected by new Fortran generation tools
- drop use of bfort
- automatically generate all the Fortran PETSc objects, enums etc from the include files
- generate most of the Fortran interface definitions and functions from the source code
- simplify the number and organization of Fortran modules

Co-authored-by: Jose E. Roman <jroman@dsic.upv.es>

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Merge remote-tracking branch 'origin/release'

Merge branch 'nmnobre/docs' into 'release'

Improve docs for norm types and FSP Schur preconditioner

See merge request petsc/petsc!8076

PCHPDDM: handle A10 != A01^T in -pc_hpddm_schur_precondition least_squares

Merge remote-tracking branch 'origin/release'

Minor documentation fixes

PCHPDDM: fix PC_HPDDM_SCHUR_PRE_LEAST_SQUARES

Reported-by: Hussam Al Daas

Kokkos: return execution space instead of reference to simplify the code

A Kokkos execution space is a shared pointer. We don't need to reference it

PCDEFLATION: skip view if not setup yet

PCMG: galerkin option must be specified after coarse spaces

Merge remote-tracking branch 'origin/release'

Merge branch 'stefanozampini/dmplex-is-blocking' into 'main'

DMPLEX: Allow more generous blocking in fields IS

See merge request petsc/petsc!8153

Fix typos

PCBDDC: must call assemblybegin/end

PCBDDCBenignDetectSaddlePoint: option to control usage of blocking in pressure fields

triangle: support all precisions

triangle is always run in double precision, but we may use it with PETSc compiled with a different precision

PCView_HPDDM: create single collective objects for all subdomains

Funded-by: France 2030 NumPEx Exa-MA (ANR-22-EXNU-0002) project

Merge remote-tracking branch 'origin/release'

clean up PCGAMG formatting

Fix bug in PetscShmgetDeallocateArray needs to call PetscCheck(!shmdt(next->addr), since that is not called in the unmap on rank 0

Reported-by: Marsha Berger
Reported-by: Randy Leveque

Remove useless code