Merge branch 'jczhang/fix-pr1377-vecscat-arg-requirement' [PR #1387]

* jczhang/fix-pr1377-vecscat-arg-requirement:
Fix issues in ex6.c when printing complex numbers

Merge branch 'jczhang/fix-vecscat-arg-requirement' [PR #1377]

* jczhang/fix-vecscat-arg-requirement:
Clarify requirements on input vectors of vecscatter

Add VecRestoreArrayRead_Nest

Remove the numbering since it is not needed and is also out of date

Update cuda vecscatter calls

Add a ScatterMode arg in cuda vecscat to select to/from context

The old code VecScatterInitializeForGPU() initializes the pointer (PetscCUDAIndices*)&inctx->spptr) based
on an input ScatterMode befo

Add a ScatterMode arg in cuda vecscat to select to/from context

The old code VecScatterInitializeForGPU() initializes the pointer (PetscCUDAIndices*)&inctx->spptr) based
on an input ScatterMode before VecScatterBegin() is called.

If a vecscatter context is firstly used for a SCATTER_FORWARD, and secondly used
for a SCATTER_REVERSE, there will be an error. Since in the second VecScatter,
it uses out-of-date (PetscCUDAIndices*)&inctx->spptr)

The solution is "do not prematurely consider ScatterMode when building (PetscCUDAIndices*)&inctx->spptr). Instead,
select correct to/from until VecScatterBegin() is called"

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VecStashSortCompress_Private: fix initialization for blocked stash

Reported-by: Stefano Zampini <stefano.zampini@gmail.com>
Reported-by: Lisandro Dalcin <dalcinl@gmail.com>

Fix problems and update comments in the test

Merge branch 'pr1351/m_diehl/m.diehl/more-fortran-interfaces-and-examples/master' [PR #1376]

* pr1351/m_diehl/m.diehl/more-fortran-interfaces-and-examples/master:
A few examples translated from C to

Merge branch 'pr1351/m_diehl/m.diehl/more-fortran-interfaces-and-examples/master' [PR #1376]

* pr1351/m_diehl/m.diehl/more-fortran-interfaces-and-examples/master:
A few examples translated from C to Fortran and additional Fortran 90 interfaces for some of the functions used in these examples.

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Add a test for vecscat on different communicators

Compare communicators of the vector arguments of VecScatterCreate

Vec ex11: Updated test output.

Merge branch 'barry/fix-chkerrq-petscinitialize' [PR #1373]

* barry/fix-chkerrq-petscinitialize:
Since the PETSc initialization may not have been completed in the failed PetscInitialize() it is not

Merge branch 'barry/fix-chkerrq-petscinitialize' [PR #1373]

* barry/fix-chkerrq-petscinitialize:
Since the PETSc initialization may not have been completed in the failed PetscInitialize() it is not proper to call the PETSc error handling routines

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Change CHKERRQ(ierr) after PetscInitialize() calls in examples to if (ierr) return ierr;

Since the PETSc initialization may not have been completed in the failed PetscInitialize() it is not
propper

Change CHKERRQ(ierr) after PetscInitialize() calls in examples to if (ierr) return ierr;

Since the PETSc initialization may not have been completed in the failed PetscInitialize() it is not
propper to call the PETSc error handling routines

Commit-type: bug-fix, testing-fix, example
Reported-by: jed Brown <jed@jedbrown.org>

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Man pages: add two missing level fields

final cleaning+testing

wrong type

new example

ex7f cannot be compile alone (part of ex7.c)

nicer way to express the same

fortran interface for vecload + some cleaning

translated from C example

working

was not used at all

make parameters immutable

some more vector examples translated from C