PetscFunctionListFind: use macro to hide (PetscVoidFunction*) cast

Casting using PetscVoidFunction* instead of (void(**)(void)) is needed
with C++ compilers that will not implicitly convert C++ lang

PetscFunctionListFind: use macro to hide (PetscVoidFunction*) cast

Casting using PetscVoidFunction* instead of (void(**)(void)) is needed
with C++ compilers that will not implicitly convert C++ language linkage
to C language linkage. Since PetscFunctionListFind() is meant to operate
on generic function pointers, we hide this language linkage detail
(which is inconsistently implemented) in a cast.

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removed string version of function name for XXXRegister(), PetscFunctionListAdd() and PetscObjectComposeFunction()

removed path and MPI_Comm arguments from PetscFunctionListFind/Add()

removed path argument to XXXInitializePackage() and XXXRegister()

removed XXXRegisterDynamic() but kept the APIs for everything else underneath the same
phase I of the update to handling registering function pointers

changed AMS publishing to use the Viewer model
added simple AMS viewer for mat,ksp,snes,ts
added --ksp/snes/ts_view_pre for starting the viewer before the solve (ugly but useful for AMS)
added PetscS

changed AMS publishing to use the Viewer model
added simple AMS viewer for mat,ksp,snes,ts
added --ksp/snes/ts_view_pre for starting the viewer before the solve (ugly but useful for AMS)
added PetscStackCalls around AMS function calls when appropriate (note do not want these in webserver because do not webserver stopping just because AMS server is down

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work on AMS interface, consistent naming, ams.h not included in petscviewer.h, no ifdefs

Hg-commit: 642571a1dc7109fdb7e5b0abb23bf260d10eb970

Change all PETSC_EXTERN_C to PETSC_EXTERN

Hg-commit: 8d2ebbb193fb583bccc64015e35640c4e08c3426

completed update of PETSC_EXTERN_C usage to replace EXTERN_C_BEGIN/END

Hg-commit: 84182841dc78e38819f60460c0b7afa4c601fbd6

Remove petscviewer.h from petscsys.h

Much of sys is independent of viewer. Viewer is used in so many other
places that it is now included by petscvec.h.

Hg-commit: 1d745f01618aa51d3043fb1f87b0546f6

Remove petscviewer.h from petscsys.h

Much of sys is independent of viewer. Viewer is used in so many other
places that it is now included by petscvec.h.

Hg-commit: 1d745f01618aa51d3043fb1f87b0546f60e6e730

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petscctable.h and petscmatlab.h shold not be included in petscsys.h

Hg-commit: 84ac1a0e8bb6899bb6d64a2004d4e3e7923b00da

added PetscObjectComm() and used it to replace (((PetscObject)obj)->comm)

Hg-commit: 3da37c458124ad48ae939f4e9823e4430ee0b8be

removed typeid from PetscHeaderCreate() args since it is not know at create time anyway

Hg-commit: 368e928141e31cf1ff6cf108913006e5886dc6cc

Make petscimpl.h private

Hg-commit: 910e8b03a54a915953944da6f75eb81c807d7428

removed PETSC_NULL from C and Fortran (except declaration in C for backward compatibility). Kept PETSC_NULL_xxx for Fortran
Fixed a few bugs where PETSC_NULL had been used incorrectly.

Hg-commit: 05

removed PETSC_NULL from C and Fortran (except declaration in C for backward compatibility). Kept PETSC_NULL_xxx for Fortran
Fixed a few bugs where PETSC_NULL had been used incorrectly.

Hg-commit: 054705a517d7f4388a8a084415d7478cbe95dff4

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