HAVE_FORTRAN should be USE_FORTRAN_BINDINGS since it is about generating the Fortran bindings, not about if the Fortran compiler exists

Fix warning found by Pierre

/local/jolivet/petsc/src/sys/classes/random/impls/curand/curand.c: In function ‘PetscRandomGetValuesReal_CURAND’:
/local/jolivet/petsc/src/sys/classes/random/impls/curand

Fix warning found by Pierre

/local/jolivet/petsc/src/sys/classes/random/impls/curand/curand.c: In function ‘PetscRandomGetValuesReal_CURAND’:
/local/jolivet/petsc/src/sys/classes/random/impls/curand/curand.c:24:65: warning: operand of ‘?:’ changes signedness from ‘PetscInt’ {aka ‘int’} to ‘unsigned int’ due to unsignedness of other operand [-Wsign-compare]
24 | size_t nn = n < 0 ? (size_t)(-2 * n) : n; /* handle complex case */
| ^

Based-on-patch-by: Pierre Jolivet <pierre@joliv.et>

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Fix some improper use of COMM_SELF in error reporting

Don't use PetscMemcpy() or PetscArraycpy() to copy the ops struct

Fix PetscCallMPI(MPI_Allreduce()) with PETSc types

Format the ftn-custom files with clang-format. Apparently no particular reason we did not format them initially

More manual page fixes

Remove need for seperate lib/petsc/conf/test file by merging with rules file

Commit-type: maintainability

non-test and tutorial makefiles only need rules.doc not the full rules

Commit-type: documentation

Only makefiles in the test and tutorial directories need lib/petsc/conf/test

Commit-type: housekeeping